Clean-up unused files

[matt-graham]

• Removes s2ftt.logs module as this appears not to be used anywhere and associated tests, dependencies and configuration file.
• Removes some configuration files added in Cufft primitive #204 which are not in use.
• Updates reference to README in manifest file to point to .md file rather than now non-existent .rst version and removes reference to non-existent pytest.ini file.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.27%. Comparing base (ea11832) to head (881337e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #271      +/-   ##
==========================================
- Coverage   96.28%   96.27%   -0.01%     
==========================================
  Files          32       31       -1     
  Lines        3606     3573      -33     
==========================================
- Hits         3472     3440      -32     
+ Misses        134      133       -1     

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