Fix global layout issues

[zackkrida]

Fixes

Fixes #825

Description

This PR makes some cleanup to the main layout logic of every page:

• Ensures the header and main content area are the first two child elements of our primary grid container, by grouping the locale banner, cc banner, and header into a div.
• Only applies our grid layout above the medium breakpoint
• Removes a hardcoded min-width: 300px from the html element
• Uses viewport width units to fix some flexbox behavior in the header, where using 100% width allowed the header to grow beyond the device width.
• Hides header logo text and content switcher label on extremely small screens via a new xs breakpoint. Time to make Openverse work on smart watches 😄
• Unrelated bugfix: Localizes the header logo link properly

In addition to fixing the layout bugs, this should put us in a better position while @panchovm works on additional header revisions.

Testing Instructions

View on an actual mobile device and by resizing your desktop browser window.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• 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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[sarayourfriend]

Code looks good so far and seems to work fine on desktop. Getting weird message-less and stack-trace-less errors on mobile browser though, so will continue debugging to see if I can find the cause of that.

[zackkrida]

@sarayourfriend I did just push some cleanup, fyi. Small tweaks to mobile.

[sarayourfriend]

Still getting the same mysterious error 😞 It prevents the JS on the page from running at all.

[zackkrida]

Suuuper weird, I don't see anything that would cause that!

[sarayourfriend]

It's the same on Firefox for Android and mobile Safari 🤔 I'll keep trying to debug.

[sarayourfriend]

It appears to be an issue on main actually.

[obulat]

Great catch!

[krysal]

Since the issue that Sara mentioned is unrelated to these changes this LGTM 👍

[krysal]

Thanks for documenting the grid logic!

[obulat]

The layout works perfectly!

[obulat]

Adding :not(:empty) is such a great solution to all the teleports taking up grid areas when empty!