Add CSS Toggle to header menu.

[jason-fox]

Add a mechanism to showcase all of the Bootswatch themes.

working example: https://jason-fox.github.io/dita-bootstrap/

This is just another small plugin: https://github.com/jason-fox/dita-bootstrap.css-toggle to host a single JavaScript file, but CSS Switching is so niche that it doesn't really need to be in the main Bootstrap plugin.

If you want I could transfer the repo to keep all the dita-bootstrap stuff together then I'd be happy to push it over.

[infotexture]

😎 Nice showcase.

Makes sense to keep this a separate plug-in, as I doubt most users of the main DITA Bootstrap one would need it (and those who do can install it separately).

No strong opinion here on whether to release it under the net.infotexture namespace or under fox.jason, but either way we should clean up the plug-in ID & name references to be consistent.

As for the name, I wonder if css-toggle is at all misleading. It does change CSS files, but since each of them is a Bootswatch theme, I wonder if something like theme-switcher would be clearer.

When I tested on https://jason-fox.github.io/dita-bootstrap/, selecting different themes from the menu did not seem to change anything.

Within this PR, we should probably append a note below the themes carousel on the landing page, to point out that you can try them out live.

[jason-fox]

I wonder if css-toggle is at all misleading. It does change CSS files, but since each of them is a Bootswatch theme, I wonder if something like theme-switcher would be clearer.

Changed to fox.jason.theme-switcher

When I tested on https://jason-fox.github.io/dita-bootstrap/, selecting different themes from the menu did not seem to change anything.

Bug fixed.

Within this PR, we should probably append a note below the themes carousel on the landing page, to point out that you can try them out live.

Note added d892459

[infotexture]

Thanks, looks good (and works).

Tweaked the copy in the new note, merging…