Add adaptdl ray to index

[rmfan]

Add adaptdl-ray to table of contents in docs

[codecov-commenter]

Codecov Report

Merging #111 (f0ffd4a) into master (11c5699) will decrease coverage by 0.75%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #111      +/-   ##
==========================================
- Coverage   62.14%   61.39%   -0.76%     
==========================================
  Files          32       32              
  Lines        2531     2531              
  Branches      416      416              
==========================================
- Hits         1573     1554      -19     
- Misses        877      896      +19     
  Partials       81       81              

Impacted Files	Coverage Δ
adaptdl/adaptdl/torch/_metrics.py	77.86% <0.00%> (-10.69%)	⬇️
adaptdl/adaptdl/sched_hints.py	50.00% <0.00%> (-8.34%)	⬇️
adaptdl/adaptdl/env.py	80.00% <0.00%> (-3.34%)	⬇️
adaptdl/adaptdl/goodput.py	97.54% <0.00%> (-1.64%)	⬇️

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