Change detection of libretexts.org special pages and add log

[benoit74]

Fix #87

Changes: instead of using page title, analyzing html body to detect libretexts.org special pages

Tested on page mentioned in issue:

Also tested successfully on page 15834 of https://geo.libretexts.org

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 49.10%. Comparing base (1ef9614) to head (2fe399a).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
scraper/src/mindtouch2zim/processor.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
- Coverage   49.20%   49.10%   -0.10%     
==========================================
  Files          17       17              
  Lines        1063     1065       +2     
  Branches      149      149              
==========================================
  Hits          523      523              
- Misses        529      531       +2     
  Partials       11       11              

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[rgaudin]

LGTM