docs: update conda installation + minor fixes

[Saransh-cpp]

Description

Update conda installation docs to reflect the new changes in the distribution (pybamm-base and pybamm).

Fixes #4653
Fixes #4630

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ pre-commit run (or $ nox -s pre-commit) (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• All tests pass: $ python -m pytest (or $ nox -s tests)
• The documentation builds: $ python -m pytest --doctest-plus src (or $ nox -s doctests)

You can run integration tests, unit tests, and doctests together at once, using $ nox -s quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[agriyakhetarpal]

I have a few changes to request here – commenting so that this doesn't get merged just yet.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.21%. Comparing base (72c23ea) to head (a567556).
Report is 21 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4667   +/-   ##
========================================
  Coverage    99.21%   99.21%           
========================================
  Files          302      302           
  Lines        22858    22878   +20     
========================================
+ Hits         22679    22699   +20     
  Misses         179      179           

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[agriyakhetarpal]

Thanks, @Saransh-cpp! Could you also add a small note with the required conda commands to this page: https://pybamm.org/learn/#installation-instructions and also mark the missing IDAKLU solver there?

[Saransh-cpp]

Thanks for the suggestions, @agriyakhetarpal!

[agriyakhetarpal]

Looks good now, thanks, @Saransh-cpp!