rename to authentik

[BeryJu]

Todos

• create full upgrade docs (config prefix rename, helm changes)
• rename GitHub project and create redirect project
• new icon
• update logos for readme
• update docs screenshots (username)
• update main screenshots in readme and docs
• update Pipeline names and references
• new sentry dsn
• add migration for expression policies

[codecov]

Codecov Report

Merging #361 (550dafe) into master (810a7ab) will decrease coverage by 0.00%.
The diff coverage is 88.68%.

@@            Coverage Diff             @@
##           master     #361      +/-   ##
==========================================
- Coverage   89.14%   89.13%   -0.01%     
==========================================
  Files         377      377              
  Lines       12259    12263       +4     
==========================================
+ Hits        10928    10931       +3     
- Misses       1331     1332       +1     

Impacted Files	Coverage Δ
authentik/admin/fields.py	50.81% <ø> (ø)
authentik/admin/forms/overview.py	100.00% <ø> (ø)
authentik/api/pagination.py	83.33% <ø> (ø)
authentik/api/v2/messages.py	100.00% <ø> (ø)
authentik/core/views/shell.py	100.00% <ø> (ø)
authentik/flows/exceptions.py	100.00% <ø> (ø)
authentik/flows/management/commands/apply_flow.py	0.00% <0.00%> (ø)
authentik/flows/management/commands/benchmark.py	0.00% <0.00%> (ø)
authentik/lib/models.py	100.00% <ø> (ø)
authentik/lib/tasks.py	91.42% <ø> (ø)
... and 861 more

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