Javascript is required to navigate

[ThrosturX]

File: index.md, CC @johndmulhausen

The navbar nav-sidebar does not work without javascript, and no indication is displayed to alert the user that javascript is required to make use of the site.

I would suggest implementing proper fallback methods (or at the very least a notice) so that users who, by choice or otherwise, are not running client-side scripts can still make use of the site.

Reproduction steps:

1. Disable javascript.
2. Navigate to any Docker documentation page.
3. Attempt to use the sidebar.
4. Notice that despite the sidebar being responsive (with CSS), navigation requires javascript (it is indeed possible to achieve this with HTML+CSS, so requiring javascript is overly restrictive).

[ThrosturX]

It seems like this affects the Docker website more extensively than I expected.
Notice that javascript is also required to view the second resultset on https://hub.docker.com/explore/#.

[johndmulhausen]

Sorry, but this is working as intended and for many reasons we can never support a JS-free version of the docs. :(

[docker-robott]

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