[docs] Update to new logo

[ChrisCummins]

CompilerGym has a new logo, thanks Christy!!

[codecov-commenter]

Codecov Report

Merging #471 (0a75274) into development (165fa83) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development     #471      +/-   ##
===============================================
- Coverage        69.55%   69.49%   -0.07%     
===============================================
  Files              110      110              
  Lines             6123     6123              
===============================================
- Hits              4259     4255       -4     
- Misses            1864     1868       +4     

Impacted Files	Coverage Δ
compiler_gym/util/timer.py	79.06% <0.00%> (-4.66%)	⬇️
compiler_gym/envs/llvm/datasets/cbench.py	76.69% <0.00%> (-0.76%)	⬇️

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