chore: Improve documentation & clean-up

[dilyabareeva]

• Update README.md and docs: new figures, new tutorials, fixing typos
• Add arguments to representer_points.py

[codecov]

Codecov Report

❌ Patch coverage is 90.64748% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.21%. Comparing base (756204e) to head (2c7a1a4).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
quanda/utils/common.py	90.76%	6 Missing ⚠️
quanda/benchmarks/config_parser.py	88.00%	3 Missing ⚠️
quanda/explainers/wrappers/representer_points.py	86.36%	3 Missing ⚠️
quanda/benchmarks/downstream_eval/_fact_tracing.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #287      +/-   ##
==========================================
+ Coverage   95.19%   95.21%   +0.02%     
==========================================
  Files          71       71              
  Lines        3747     3785      +38     
==========================================
+ Hits         3567     3604      +37     
- Misses        180      181       +1     

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