Update community link and add discord badge

[psanders]

This branch updates the community link to point to the discord community and adds an additional badge to the header.

[github-actions[bot]]

:tada: This PR is included in version 1.5.3-rc.1 :tada:

The release is available on:

• npm package (@rc dist-tag)
• GitHub release

Your semantic-release bot :package::rocket:

[github-actions[bot]]

:tada: This PR is included in version 1.5.3 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: