Add bootstrap.min.css.map

[texpert]

I remember someone was asking where is the sourcemap, so added.

[brian-kephart]

I haven't worked much with source maps, so I'm not sure how to review this PR. Adding it seems like a good idea though. LMK if there's anything in particular to check.

[texpert]

I haven't worked much with source maps, so I'm not sure how to review this PR. Adding it seems like a good idea though. LMK if there's anything in particular to check.

Thanks for approval, @brian-kephart!

Nothing to check in the PR - I have just checked if the map is precompiled into the assets and loaded into the browser.

It works OK in the development environment if the config.assets.debug = true is set.

As for production, I don't think it will work, because the sourcemap of the asset is failing to load, being required additionally in a theme - the browser is trying to load the sourcemap from a theme related path.

For debugging reasons, the config.assets.debug = true can be also set in production, see rails/sprockets#502 (comment).