Get the whole page tree and process options to filter it

[benoit74]

Changes:

• build a tree of website pages, with links between them (parent and children, since the tree is exposed like this - a node can have only one parent)
• filter this tree of pages based on CLI input arguments (useful at least for debug, but I see use cases for production as well, one might be interested in only one course for instance)

Nota: to be reviewed after #4 is merged

[codecov]

Codecov Report

Attention: Patch coverage is 59.25926% with 33 lines in your changes missing coverage. Please review.

Project coverage is 47.54%. Comparing base (e7a408c) to head (35b5448).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
scraper/src/libretexts2zim/client.py	57.14%	23 Missing and 1 partial ⚠️
scraper/src/libretexts2zim/processor.py	72.72%	6 Missing ⚠️
scraper/src/libretexts2zim/entrypoint.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #5      +/-   ##
==========================================
+ Coverage   44.94%   47.54%   +2.60%     
==========================================
  Files           7        7              
  Lines         336      408      +72     
  Branches       32       40       +8     
==========================================
+ Hits          151      194      +43     
- Misses        184      212      +28     
- Partials        1        2       +1     

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[rgaudin]

I agree the filter can be handy for various reasons. We dont have to expose them on ZF at first. user-written regex often leads to frustration