what to do with Other licenses

## Problem
There is a category in Open Source licenses called 'Other' which could be improved.

- In a PR https://github.com/cncf/landscape/pull/2083 BSL, SSPL marked as not opensource and merged, but they are considered "Other" which fall under the Open Source category when filtering in the website.

## Solution
Maybe create a "Source Available" category under "Not Open Source" with BSL/BUSL, SSPL etc. sub categories under it.

Then dgraph, redpanda, elastic, cockroachdb, hashicorp etc. can be moved to appropriate sub category one of BSL/BUSL, SSPL, AppsCode, etc.

And a "Other" under "Source Availble" or under "Not open source" which includes something like [inlets/inlets-pro](https://github.com/inlets/inlets-pro/blob/master/EULA.md)

### PS
I planned to contribute but am not sure how processed_landcape.yml file is getting updated, also CNCF-Bot [stopped committing](https://github.com/cncf/landscape/commits/master/processed_landscape.yml) to it since a few months.
I can see that https://github.com/cncf/clomonitor is somehow utilized but it is not clear where in this repo it is being called from, checked github workflows they are not it.