Do not duplicate project search form

[abitrolly]

Currently search form for projects present both in page header and in results table header. This PR leaves search form in table header only when searching inside distros.

[codecov-io]

Codecov Report

Merging #877 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #877   +/-   ##
=======================================
  Coverage   97.32%   97.32%           
=======================================
  Files          61       61           
  Lines        3697     3697           
  Branches      499      499           
=======================================
  Hits         3598     3598           
  Misses         58       58           
  Partials       41       41

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[Zlopez]

Few things:

• Format should not be only targeted on diff
• Add news file
• Squash commits

[abitrolly]

Squashed, moved black to another PR and added new fragment.