Support namespace CRUD

[Venjy]

This closes #137

• Add banner home, cluster and community
• Support namespace listing, creation, and deletion

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d01e985) 25.91% compared to head (b208599) 24.67%.
Report is 20 commits behind head on unstable.

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable     #149      +/-   ##
============================================
- Coverage     25.91%   24.67%   -1.25%     
============================================
  Files            31       42      +11     
  Lines          2639     3595     +956     
============================================
+ Hits            684      887     +203     
- Misses         1861     2597     +736     
- Partials         94      111      +17     

Flag	Coverage Δ
unittests	24.67% <ø> (-1.25%)	⬇️

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[PragmaTwice]

Could you publish the web app to somewhere (e.g. surge.sh) that we can have a try?

[git-hulk]

@PragmaTwice I have tried it on my side and it looks good.

[PragmaTwice]

Thank you for your contribution!