Communities update

[tmorrell]

Description

The submit link that comes back from the InvenioRDM communities request is broken https://github.com/inveniosoftware/invenio-app-rdm/issues/2269. I've hard-coded in the correct api endpoint, since it's not clear how long it will take the InvenioRDM folks to fix it. I also fixed a couple other small bugs.

Software environment

Please include the following information:

• Version of the software: v1.1

Checklist

Please check that the following have been done:

• [x] the description section above has been filled out
• [x] the software environment section above has been filled out
• [x] this PR is against develop or another branch and not main

[tmorrell]

Thanks! I've implemented the changes