updated dApps dropdown, added docs/about styles, asking to remove clg

[abhiram11]

This PR tries to fix a UI bug that happens between screen sizes 768px to 992px. It also adds a few styling attributes in CSS that were supposedly missing for docs and about dropdowns.

Here's how it looked before:

kleros.old.mp4

Here's how it looks after the fix:

kleros.new.mp4

Before merging, I would like to have your review on the things below:

1. How should the dropdown's arrow icon react to clicks/collapse? I have edited the styling for dApps for your reference.
2. Should the style className IDs be different for .usecases, .research, .governance, .docs, .about, etc. ? As they are displayed in a similar fashion, we can define just one class style for them.
3. If the console.log() are not required in index.js, I can remove them as well.
4. There were empty rulesets in the CSS file that I have modified, let me know what to do about them.

Thanks! : )

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