Rename scraper from libretexts to mindtouch and make it as generic as possible

[benoit74]

Fix #6

Changes:

• rename everything that needs to be
• drop the --library-slug argument which made sense only in libretexts.org context
• add more mandatory CLI argument now that scraper is generic (no more meaningful default value possible)
• fix Dockerfile casing
• adapt to new Dockerfile convention on LABEL label=key instead of LABEL label key
• add missing openzim.toml in Dockerfile at proper stage
• add more tests around files present in the ZIM
• add missing .pre-commit-config.yaml (how did we missed that?)
• remove double checks for metadata length (no need to do it in scraper, already done in zimscraperlib)
• simplified placeholder handling (drop metadata class) since we have very few placeholder now (only name and period, used to compute the filename)

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 21 lines in your changes missing coverage. Please review.

Project coverage is 44.28%. Comparing base (018982a) to head (5381b22).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
scraper/src/mindtouch2zim/client.py	31.57%	13 Missing ⚠️
scraper/src/mindtouch2zim/processor.py	40.00%	6 Missing ⚠️
scraper/src/mindtouch2zim/__main__.py	0.00%	1 Missing ⚠️
scraper/src/mindtouch2zim/entrypoint.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
- Coverage   45.69%   44.28%   -1.41%     
==========================================
  Files           8        8              
  Lines         499      481      -18     
  Branches       53       51       -2     
==========================================
- Hits          228      213      -15     
+ Misses        269      266       -3     
  Partials        2        2              

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[rgaudin]

LGTM

[benoit74]

Thank you!