Filter feed by hub slug, add a way to filter out journals from hubs

[koutst]

• Add filter for feed by hub slug
• Add a filter for excluding journals from hubs

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.

Project coverage is 67.50%. Comparing base (d05a155) to head (9f15641).
Report is 20 commits behind head on master.

Files with missing lines	Patch %	Lines
src/feed/views.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2127   +/-   ##
=======================================
  Coverage   67.49%   67.50%           
=======================================
  Files         430      430           
  Lines       24001    24011   +10     
=======================================
+ Hits        16200    16209    +9     
- Misses       7801     7802    +1     

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[gzurowski]

LGTM 👍