Remove email addresses and (!UNKNOWN) from author names

[felixfontein]

As an example, compare https://ansible.fontein.de/collections/ansible/builtin/sequence_lookup.html#authors to https://docs.ansible.com/ansible/latest/collections/ansible/builtin/sequence_lookup.html#authors - the former docsite uses this PR, the latter does not (yet).

[samccann]

can't comment on the code, but the output LGTM!

[felixfontein]

The last commit improves some edge cases:

diff -r rst_/collections/community/dns/hosttech_dns_records_inventory.rst rst/collections/community/dns/hosttech_dns_records_inventory.rst
507c507
< - Markus Bergholz (@markuman) <markuman+
---
> - Markus Bergholz (@markuman) 
diff -r rst_/collections/community/general/iocage_connection.rst rst/collections/community/general/iocage_connection.rst
214c214
< - Stephan Lohse  <dev-
---
> - Stephan Lohse  

[gundalow]

Thank you for this.

[felixfontein]

@samccann @gundalow thanks for reviewing this!