Use zimscraperlib session to fetch web content with automatic meaningful retries

[benoit74]

Fix #32

[codecov]

Codecov Report

Attention: Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.

Project coverage is 37.66%. Comparing base (a2b3708) to head (9c69ae6).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
scraper/src/mindtouch2zim/processor.py	20.00%	4 Missing ⚠️
scraper/src/mindtouch2zim/client.py	50.00%	2 Missing ⚠️
scraper/src/mindtouch2zim/vimeo.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   37.57%   37.66%   +0.09%     
==========================================
  Files           9        9              
  Lines         676      677       +1     
  Branches       84       84              
==========================================
+ Hits          254      255       +1     
  Misses        420      420              
  Partials        2        2              

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[rgaudin]

LGTM