docs: update CAvatar documentation

Author: mrholek

packages/docs/content/components/avatar.mdx

@@ -1,7 +1,7 @@
 ---
 title: React Avatar Component
 name: Avatar
-description: React avatar component can be used to display circular user profile pictures. Avatar can be used to portray people or objects. It supports images, icons, or letters.
+description: The React Avatar component is used to display circular user profile pictures. React avatars can portray people or objects and support images, icons, or letters.
 menu: Components
 route: /components/avatar
 other_frameworks: avatar
@@ -15,6 +15,8 @@ import Avatar3 from './../assets/images/avatars/3.jpg'
 
 ## Image avatars
 
+Showcase React avatars using images. These avatars are typically circular and can display user profile pictures.
+
 ```jsx preview
 <CAvatar src={Avatar1} />
 <CAvatar src={Avatar2} />
@@ -23,12 +25,36 @@ import Avatar3 from './../assets/images/avatars/3.jpg'
 
 ## Letter avatars
 
+Use letters inside avatars to represent users or objects when images are not available. This can be useful for displaying initials.
+
 ```jsx preview
 <CAvatar color="primary" textColor="white">CUI</CAvatar>
 <CAvatar color="secondary">CUI</CAvatar>
 <CAvatar color="warning" textColor="white">CUI</CAvatar>
 ```
 
+## Icons avatars 
+
+Incorporate icons within React avatars, allowing for a visual representation using scalable vector graphics (SVG).
+
+```jsx preview
+<CAvatar color="info" textColor="white">
+  <svg id="cib-coreui-c" className="icon" viewBox="0 0 32 32">
+    <path d="M27.912 7.289l-10.324-5.961c-0.455-0.268-1.002-0.425-1.588-0.425s-1.133 0.158-1.604 0.433l0.015-0.008-10.324 5.961c-0.955 0.561-1.586 1.582-1.588 2.75v11.922c0.002 1.168 0.635 2.189 1.574 2.742l0.016 0.008 10.322 5.961c0.455 0.267 1.004 0.425 1.59 0.425 0.584 0 1.131-0.158 1.602-0.433l-0.014 0.008 10.322-5.961c0.955-0.561 1.586-1.582 1.588-2.75v-11.922c-0.002-1.168-0.633-2.189-1.573-2.742zM27.383 21.961c0 0.389-0.211 0.73-0.526 0.914l-0.004 0.002-10.324 5.961c-0.152 0.088-0.334 0.142-0.53 0.142s-0.377-0.053-0.535-0.145l0.005 0.002-10.324-5.961c-0.319-0.186-0.529-0.527-0.529-0.916v-11.922c0-0.389 0.211-0.73 0.526-0.914l0.004-0.002 10.324-5.961c0.152-0.090 0.334-0.143 0.53-0.143s0.377 0.053 0.535 0.144l-0.006-0.002 10.324 5.961c0.319 0.185 0.529 0.527 0.529 0.916z"></path><path d="M22.094 19.451h-0.758c-0.188 0-0.363 0.049-0.515 0.135l0.006-0.004-4.574 2.512-5.282-3.049v-6.082l5.282-3.051 4.576 2.504c0.146 0.082 0.323 0.131 0.508 0.131h0.758c0.293 0 0.529-0.239 0.529-0.531v-0.716c0-0.2-0.11-0.373-0.271-0.463l-0.004-0.002-5.078-2.777c-0.293-0.164-0.645-0.26-1.015-0.26-0.39 0-0.756 0.106-1.070 0.289l0.010-0.006-5.281 3.049c-0.636 0.375-1.056 1.055-1.059 1.834v6.082c0 0.779 0.422 1.461 1.049 1.828l0.009 0.006 5.281 3.049c0.305 0.178 0.67 0.284 1.061 0.284 0.373 0 0.723-0.098 1.027-0.265l-0.012 0.006 5.080-2.787c0.166-0.091 0.276-0.265 0.276-0.465v-0.716c0-0.293-0.238-0.529-0.529-0.529z"></path>
+  </svg>
+</CAvatar>
+<CAvatar color="success" textColor="white">
+  <svg id="cib-coreui-c" className="icon" viewBox="0 0 32 32">
+    <path d="M27.912 7.289l-10.324-5.961c-0.455-0.268-1.002-0.425-1.588-0.425s-1.133 0.158-1.604 0.433l0.015-0.008-10.324 5.961c-0.955 0.561-1.586 1.582-1.588 2.75v11.922c0.002 1.168 0.635 2.189 1.574 2.742l0.016 0.008 10.322 5.961c0.455 0.267 1.004 0.425 1.59 0.425 0.584 0 1.131-0.158 1.602-0.433l-0.014 0.008 10.322-5.961c0.955-0.561 1.586-1.582 1.588-2.75v-11.922c-0.002-1.168-0.633-2.189-1.573-2.742zM27.383 21.961c0 0.389-0.211 0.73-0.526 0.914l-0.004 0.002-10.324 5.961c-0.152 0.088-0.334 0.142-0.53 0.142s-0.377-0.053-0.535-0.145l0.005 0.002-10.324-5.961c-0.319-0.186-0.529-0.527-0.529-0.916v-11.922c0-0.389 0.211-0.73 0.526-0.914l0.004-0.002 10.324-5.961c0.152-0.090 0.334-0.143 0.53-0.143s0.377 0.053 0.535 0.144l-0.006-0.002 10.324 5.961c0.319 0.185 0.529 0.527 0.529 0.916z"></path><path d="M22.094 19.451h-0.758c-0.188 0-0.363 0.049-0.515 0.135l0.006-0.004-4.574 2.512-5.282-3.049v-6.082l5.282-3.051 4.576 2.504c0.146 0.082 0.323 0.131 0.508 0.131h0.758c0.293 0 0.529-0.239 0.529-0.531v-0.716c0-0.2-0.11-0.373-0.271-0.463l-0.004-0.002-5.078-2.777c-0.293-0.164-0.645-0.26-1.015-0.26-0.39 0-0.756 0.106-1.070 0.289l0.010-0.006-5.281 3.049c-0.636 0.375-1.056 1.055-1.059 1.834v6.082c0 0.779 0.422 1.461 1.049 1.828l0.009 0.006 5.281 3.049c0.305 0.178 0.67 0.284 1.061 0.284 0.373 0 0.723-0.098 1.027-0.265l-0.012 0.006 5.080-2.787c0.166-0.091 0.276-0.265 0.276-0.465v-0.716c0-0.293-0.238-0.529-0.529-0.529z"></path>
+  </svg>
+</CAvatar>
+<CAvatar color="danger" textColor="white">
+  <svg id="cib-coreui-c" className="icon" viewBox="0 0 32 32">
+    <path d="M27.912 7.289l-10.324-5.961c-0.455-0.268-1.002-0.425-1.588-0.425s-1.133 0.158-1.604 0.433l0.015-0.008-10.324 5.961c-0.955 0.561-1.586 1.582-1.588 2.75v11.922c0.002 1.168 0.635 2.189 1.574 2.742l0.016 0.008 10.322 5.961c0.455 0.267 1.004 0.425 1.59 0.425 0.584 0 1.131-0.158 1.602-0.433l-0.014 0.008 10.322-5.961c0.955-0.561 1.586-1.582 1.588-2.75v-11.922c-0.002-1.168-0.633-2.189-1.573-2.742zM27.383 21.961c0 0.389-0.211 0.73-0.526 0.914l-0.004 0.002-10.324 5.961c-0.152 0.088-0.334 0.142-0.53 0.142s-0.377-0.053-0.535-0.145l0.005 0.002-10.324-5.961c-0.319-0.186-0.529-0.527-0.529-0.916v-11.922c0-0.389 0.211-0.73 0.526-0.914l0.004-0.002 10.324-5.961c0.152-0.090 0.334-0.143 0.53-0.143s0.377 0.053 0.535 0.144l-0.006-0.002 10.324 5.961c0.319 0.185 0.529 0.527 0.529 0.916z"></path><path d="M22.094 19.451h-0.758c-0.188 0-0.363 0.049-0.515 0.135l0.006-0.004-4.574 2.512-5.282-3.049v-6.082l5.282-3.051 4.576 2.504c0.146 0.082 0.323 0.131 0.508 0.131h0.758c0.293 0 0.529-0.239 0.529-0.531v-0.716c0-0.2-0.11-0.373-0.271-0.463l-0.004-0.002-5.078-2.777c-0.293-0.164-0.645-0.26-1.015-0.26-0.39 0-0.756 0.106-1.070 0.289l0.010-0.006-5.281 3.049c-0.636 0.375-1.056 1.055-1.059 1.834v6.082c0 0.779 0.422 1.461 1.049 1.828l0.009 0.006 5.281 3.049c0.305 0.178 0.67 0.284 1.061 0.284 0.373 0 0.723-0.098 1.027-0.265l-0.012 0.006 5.080-2.787c0.166-0.091 0.276-0.265 0.276-0.465v-0.716c0-0.293-0.238-0.529-0.529-0.529z"></path>
+  </svg>
+</CAvatar>
+```
+
 ## Rounded avatars
 
 Use the `shape="rounded"` prop to make react avatars squared with rounded corners.
@@ -51,25 +77,49 @@ Use the `shape="rounded-0"` prop to make react avatars squared.
 
 ## Sizes
 
-Fancy larger or smaller react avatar component? Add `size="xl"`, `size="lg"` or `size="sm"` for additional sizes.
+Fancy larger or smaller react avatar component? Add `size="xl"`, `size="lg"`, `size="md"` or `size="sm"` for additional sizes.
 
 ```jsx preview
 <CAvatar color="secondary" size="xl">CUI</CAvatar>
 <CAvatar color="secondary" size="lg">CUI</CAvatar>
+<CAvatar color="secondary" size="md">CUI</CAvatar>
 <CAvatar color="secondary">CUI</CAvatar>
 <CAvatar color="secondary" size="sm">CUI</CAvatar>
 ```
 
 ## Avatars with status
 
+Add a status indicator to avatars using the `status` property to show online or offline status.
+
 ```jsx preview
 <CAvatar src={Avatar1} status="success" />
 <CAvatar color="secondary" status="danger">CUI</CAvatar>
 ```
 
+## Customizing
+
+### CSS variables
+
+React avatars use local CSS variables on `.avatar` for enhanced real-time customization. Values for the CSS variables are set via Sass, so Sass customization is still supported, too.
+
+<ScssDocs file="_avatar.scss" capture="avatar-css-vars"/>
+
+#### How to use CSS variables
+
+```jsx
+const vars = {
+  '--my-css-var': 10,
+  '--my-another-css-var': 'red',
+}
+return <CAvatar style={vars}>...</CAvatar>
+```
+
+### SASS variables
+
+<ScssDocs file="_variables.scss" capture="avatar-variables"/>
+
 ## API
 
 ### CAvatar
 
 `markdown:CAvatar.api.mdx`
-