Add space between MaterialTemplate app and site title separator

[philippjfr]

Fixes #5871

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (182b51c) 84.12% compared to head (121a32f) 84.14%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5905      +/-   ##
==========================================
+ Coverage   84.12%   84.14%   +0.01%     
==========================================
  Files         291      291              
  Lines       42655    42655              
==========================================
+ Hits        35884    35891       +7     
+ Misses       6771     6764       -7     

Flag	Coverage Δ
ui-tests	40.81% <ø> (-0.01%)	⬇️
unitexamples-tests	72.58% <ø> (+0.01%)	⬆️

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[itsgifnotjiff]

This has been bugging me enough to piss me off but not enough to look into it enough to fix it myself apart from trying to create the correct spacing through permutations of CSS, JS, Python f-strings (don't ask) and others. Thank you for this small but much appreciated fix Mr. Phillipe.