Per https://github.com/bower/bower.json-spec/pull/43 :
> Use source files with module exports and imports over pre-built distribution files.

Also, the example in that PR doesn't include
/dist/movement.css or /dist/movement.min.css
in its `main`.

If you have a complaint about this, take it up with the Bower folks:
https://github.com/bower/bower.json-spec/issues

Per https://github.com/bower/bower.json-spec/pull/43 :
> font files [...] are not `main` files as they are not entry-points.

If you have a complaint about this, take it up with the Bower folks:
https://github.com/bower/bower.json-spec/issues

If Bootstrap is installed through bower, the woff2 font file may not be
copied over as it's not in the "main" files. The LESS files still
reference the font file which results in errors.

Fixes #14809.
Closes #14825.

- Replace `*.html`, `docs/assets` and `examples` with `docs` (new directory)
- Instead of `_*`, it's just `_config.yml`, without regex (speeds up bower download a few milliseconds)

Excluding fonts/ from bower installs causes glyphicons to be
unavailable to projects using development Bootstrap LESS files.

Using wildcards to specify fonts causes errors for other
npm modules, EG, https://github.com/blittle/bower-installer/issues/33.
Additionally, it’s better to lock down files included in a
library.

I've kept only the files I consider relevant to bower installation:

- Files in dist directory;
- Files in js directory;
- Files in less directory;
- bower.json file;
- README.md file;
- LICENSE file.

When using bower the "main" property is used to specify the files that should be consumed by applications including the package as a dependency.
Without including the fonts in this array the glyphicons do not work correctly as the relative font paths do not work after the "main" files are copied into my projects public dir using tools like https://github.com/yatskevich/grunt-bower-task

For now I have manually copied the fonts dir in the location needed for my project. But by accepting this pull request this will not be necessary for me or for other people that use bower.

Fixes #8985