[openstreetmap/openstreetmap-website] Don't include unused bootstrap css (PR #4250)

[Anton Khorev]

Include only Bootstrap components that are in use as recommended [here](https://getbootstrap.com/docs/5.1/customize/sass/#importing)
by creating `_bootstrap-custom.scss` as described [here](https://github.com/twbs/bootstrap-rubygem#sass-individual-components).
Results in ~10% smaller css.

Actually I do this to modify Bootstrap's theme colors. It has to be done after importing variables but before importing components, and I can't do that if everything is imported in one `@import`.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/4250

-- Commit Summary --

  * Don't include unused bootstrap css

-- File Changes --

    A app/assets/stylesheets/_bootstrap-custom.scss (53)
    M app/assets/stylesheets/common.scss (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/4250.patch
https://github.com/openstreetmap/openstreetmap-website/pull/4250.diff

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