add glossary

[marcocuturi]

adds a glossary.rst file and modifies documentation in multiple files to refer to terms in that glossary

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.13%. Comparing base (c9d3a49) to head (f472973).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #594   +/-   ##
=======================================
  Coverage   88.13%   88.13%           
=======================================
  Files          73       73           
  Lines        7768     7768           
  Branches      556      556           
=======================================
  Hits         6846     6846           
  Misses        779      779           
  Partials      143      143           

Files with missing lines	Coverage Δ
src/ott/neural/methods/expectile_neural_dual.py	0.00% <ø> (ø)
src/ott/neural/methods/monge_gap.py	91.20% <ø> (ø)
src/ott/solvers/linear/implicit_differentiation.py	88.76% <ø> (ø)
src/ott/solvers/linear/sinkhorn.py	99.38% <ø> (ø)
src/ott/solvers/quadratic/gromov_wasserstein.py	88.42% <ø> (ø)

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[marcocuturi]

thanks @michalk8 ! please feel free to merge directly if you are ok.

[michalk8]

LGTM, thanks a lot!