Make Homepage and Searchbar RTL-compatible

[obulat]

Fixes

Related to #428 by @obulat
Fixes #424 by @dhruvkb

Description

This PR made the Homepage and Search page RTL-compatible:

The search bar both on the Homepage and on the Search page has corners of the input and button correctly rounded both in LTR and RTL modes.
The "safer browsing" icon is removed, as in the transitional styles mockup, and its padding is adjusted.
The scroll to top button is moved to the opposite corner.

Testing Instructions

You can set the language to Arabic using the Locale chooser in the footer of non-embedded page: http://localhost:8443?embedded=false, and then look at the RTL styles.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
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• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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[dhruvkb]

Amazing work!

[dhruvkb]

Would be preferable to use the { 'class': boolean } syntax here.

[sarayourfriend]

LGTM! 🚀

[sarayourfriend]

Why is this changing?

[obulat]

Because previously we didn't have the sizes in mock filters in this test. Without them, the filter handling in search store fails. And after adding the sizes option, the number of filters goes up 3 (for small, medium and large, IIRC). The filters filtering (or typing, maybe) needs to be a bit more robust, I guess, because sometimes tests pass non-array objects to some functions that use .filter over them.

[sarayourfriend]

Ah okay, thanks for explaining 🙂 I saw that we added the sizes to the filter but I didn't realize it added three more options instead of just one size 😂 But I get it now!