[Code Together] Categorizing the qubit gates in the documentation #1566

[Pratul-Saini]

Description of the Change: The documentation in pennylane/doc/introduction/operations.rst has been updated to mirror the code in pennylane/ops/qubit. Specifically, Qubit Gates has been divided into categories that already exist and other new categories.

Benefits: The documentation is now more in line with the code and hence operations will be easier to find.

Related GitHub Issues: #1566

[codecov]

Codecov Report

Merging #1583 (81f7da2) into master (068439f) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 81f7da2 differs from pull request most recent head 18b2a59. Consider uploading reports for the commit 18b2a59 to get more accurate results

@@            Coverage Diff             @@
##           master    #1583      +/-   ##
==========================================
- Coverage   99.16%   99.16%   -0.01%     
==========================================
  Files         189      189              
  Lines       13642    13625      -17     
==========================================
- Hits        13528    13511      -17     
  Misses        114      114              

Impacted Files	Coverage Δ
pennylane/ops/qubit/non_parametric_ops.py	96.68% <0.00%> (-0.14%)	⬇️
pennylane/ops/qubit/__init__.py	100.00% <0.00%> (ø)
pennylane/devices/default_qubit.py	100.00% <0.00%> (ø)

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[rmoyard]

Hey @Pratul-Saini , thank you very much for the contribution we will review it soon 👍 You can add your change to the CHANGELOG.md and also add you as contributor.

[Pratul-Saini]

Going to open a new pull request to simplify as I have made things messy haha. Sorry about this - still kind of new to github