Improve overall wording

[iddev5]

This PR makes changes to wording and structure.
No change in code is made. Even the comments in code are not modified so as to be decided separately in future.

[alichraghi]

thank you!

[iddev5]

@alichraghi I just noticed that this PR had a weird side effect that the front page got dropped down to bottom because all other pages having numbers. I didn't not liked the approach the framework is doing for ordering. But maybe we need to change it back to being numbered? (if no other solution is found)

The reason behind removal of indexing from README.md page is that, its the home page and having it numbered might not look good. In another case, it can have the number index 0 to indicate that's its a special page.

[alichraghi]

I think if we change the name of the main page from h1 to h2 tag, it will be removed from the list, but it will always be displayed as the main page. or, as you said, put 0 behind it

[iddev5]

The first solution sounds okay to me!

[alichraghi]

@iddev5 does't work :(
i'll try your solution