refactor: simplified navbar creation with macros

[jstucke]

• refactor: simplified 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 92.05%. Comparing base (e39728e) to head (04f7a60).
⚠️ Report is 14 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1423      +/-   ##
==========================================
+ Coverage   92.03%   92.05%   +0.01%     
==========================================
  Files         372      374       +2     
  Lines       21075    21098      +23     
==========================================
+ Hits        19397    19421      +24     
+ Misses       1678     1677       -1     

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