Add BSD License

After testing on 21.02-ALPHA it seems like 21.02-ALPHA doesn't actually support the definitions/certificate and definitions/certificateAuthority very well (if at all).

Setting the stable to 21.04-ALPHA seems okey, while it isn't officially a planned release, it can always be adapted to the actual release date in the future.

The link to the upstream Helm Chart Developer Reference is broken (404), this is the right link.

Allow running privileged containers

Change versioning for official apps

Update charts train for 21.02 release

Add support for TLS in minio chart

Following items were updated:
Updated nextcloud (1.2.0 versions)

Updated ipfs (1.0.1 versions)

Updated ix-chart (2101.0.0 versions)

Updated minio (1.1.0, 1.2.0 versions)

Updated plex (1.1.0 versions)

Introduce Library Chart for Official Catalog