refactor: simplidied navbar creation with macros

[jstucke]

• refactor: simplidied navbar creation with macros
• refactor: turn jinja filters without arguments into functions

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.98%. Comparing base (d5466a8) to head (58d92d9).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1423   +/-   ##
=======================================
  Coverage   91.97%   91.98%           
=======================================
  Files         372      374    +2     
  Lines       21015    21038   +23     
=======================================
+ Hits        19328    19351   +23     
  Misses       1687     1687           

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