Handle pages title and favicon

[benoit74]

Fix #23

Changes:

• add --illustration to pass URL to illustration to use as ZIM illustration and favicon
• if no --illustration is passed, try to guess best illustration from homepage favicon(s) (preferring apple icon which is bigger than favicons)
• handle conversion to PNG (including for SVG) and resize to 48x48 for ZIM illustration
• handle conversion to ICO and resize to 32x32 for favicon
• add warning about issues on dev server around assets with question mark
• update page title when navigation in the UI
• add navigation back to home when main logo is clicked

[codecov]

Codecov Report

Attention: Patch coverage is 22.22222% with 35 lines in your changes missing coverage. Please review.

Project coverage is 39.54%. Comparing base (e03c789) to head (deebfa3).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
scraper/src/mindtouch2zim/processor.py	20.00%	32 Missing ⚠️
scraper/src/mindtouch2zim/client.py	50.00%	2 Missing ⚠️
scraper/src/mindtouch2zim/entrypoint.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
- Coverage   40.54%   39.54%   -1.01%     
==========================================
  Files           8        8              
  Lines         582      612      +30     
  Branches       70       71       +1     
==========================================
+ Hits          236      242       +6     
- Misses        344      368      +24     
  Partials        2        2              

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[rgaudin]

LGTM