remove pdf documentation

[AurelienJaquier]

Description

There was no substantial information in the pdf that were not already present in the official doc. The official doc was based on the pdf I believe, so many things were similar. But since the doc has been kept up to date, it is actually more detailed than the pdf, exception to the algorithm descriptions.

Checklist:

• Unit tests are added to cover the changes (skip if not applicable).
• The changes are mentioned in the documentation (skip if not applicable).
• CHANGELOG file is updated (skip if not applicable).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.51%. Comparing base (2cddd26) to head (14e6089).
Report is 33 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #412      +/-   ##
==========================================
- Coverage   91.73%   91.51%   -0.22%     
==========================================
  Files          36       39       +3     
  Lines        6278     7744    +1466     
  Branches     2033     2366     +333     
==========================================
+ Hits         5759     7087    +1328     
- Misses        266      316      +50     
- Partials      253      341      +88     

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