[multiple] Move Frameworks and Libraries to "Frameworks and Libraries" section.

[luminist7]

In another PR I am adding support for a "Frameworks and Libraries" section. This will help the community find docs on frameworks and libraries, and also encourage the community to document more frameworks.

In this PR, I am moving existing frameworks over to the "Frameworks and Libraries" section. Eventually, I hope many more frameworks like React, Express, Django, etc. will be created and added to Frameworks.

This is a small, but important change. I think it will really help direct the community to document more frameworks on learn x in y, which would be very helpful to developers.

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After:

[vendethiel]

I don't think I've been active enough around here recently to have a say in the decision :).

[luminist7]

@adambard let me know what you think. Also @divayprakash

[vendethiel]

This has diverged a lot with master.

[luminist7]

Resolved conflicts and updated the branch.