Replace bootstrap related local libraries with npm dependencies

[krausvo1]

I have replaced bootstrap related local libraries with npm dependencies, namely bootstrap, bootstrap-dialog and selectize.

I have kept the same versions of bootstrap and bootstrap-dialog, but I have upgraded selectize from 0.12.1 to 0.14.0., because:

• selectize 0.12.1 (at least its npm version) has dependencies microplugin and sifter that need to be provided by us (they already are, but not explicitly in commons package.json) and their paths need to be explicitly mentioned in downstream project's require configuration (forgerock-ui-mock/src/main.js).
• These dependencies are bundled together with @selectize/selectize since 0.14.0 (package was renamed since 0.13.x), so we don't need to care about them. This is also the only major breaking change since 0.12.1, so nothing should break with this upgrade (see changelog).
• I have also considered upgrading to the latest version, but there have been few stale issues introduced in 0.15.x without any reaction from the maintainer, so I would rather stay at 0.14.0.

I have quickly tested the mock project and everything seems to work fine as it did before.

[pavelhoral]

LGTM

There might be something wrong with Selectize styles in a sense that focus does not have a proper CSS, However this was broken before this PR. I would love to check this before merging.

Also another thing I would like to check if we need the full Bootstrap JS. But I guess that we do.

[krausvo1]

Also another thing I would like to check if we need the full Bootstrap JS. But I guess that we do.

I don't know if we need it, just for the record - the JS components mentioned in config.json that was used to generate the former Bootstrap JS bundle contains all the JS components that Bootstrap 3 offers. So I did not bother importing only specific components.

Also, I suppose we can now delete that config file since we won't need it anymore...?

[pavelhoral]

There might be something wrong with Selectize styles in a sense that focus does not have a proper CSS,

It is behaving correctly - component looks the same as on Selectize's demo page.