Restructure Model Configuration Documentation

[isaacgsmith]

Description

This restructures the model configuration documentation. This is the first step in this process -- more will be done in the future.

I am sure there are many changes I need to make so any feedback will be appreciated. It is a bit of a complicated page to write.

Motivation and context

This page has needed serious restructuring after #1643.

How has this been tested?

• Testing pipeline.
• Docs built locally.

Examples

See https://smithis7.github.io/tardis/branch/config_reorganize_doc/io/configuration/components/models/index.html

Type of change

• Bug fix.
• New feature.
• Breaking change.
• None of the above.

Checklist

• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
  • (optional) I have built the documentation on my fork following the instructions.
• I have assigned and requested two reviewers for this pull request.

[tardis-bot]

Before a pull request is accepted, it must meet the following criteria:

• Is the necessary information provided?
• Is this a duplicate PR?
  • If a new PR is clearly a duplicate, ask how this PR is different from the original PR?
  • If this PR is about to be merged, close the original PR with a link to this new PR that solved the issue.
• Does it pass existing tests and are new tests provided if required?
  • The test coverage should not decrease, and for new features should be close to 100%.
• Is the code tidy?
  • No unnecessary print lines or code comments.

[codecov]

Codecov Report

Merging #1721 (8661aab) into master (d3f13ed) will not change coverage.
The diff coverage is n/a.

❗ Current head 8661aab differs from pull request most recent head 41ea3d3. Consider uploading reports for the commit 41ea3d3 to get more accurate results

@@           Coverage Diff           @@
##           master    #1721   +/-   ##
=======================================
  Coverage   61.87%   61.87%           
=======================================
  Files          63       63           
  Lines        5852     5852           
=======================================
  Hits         3621     3621           
  Misses       2231     2231           

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[isaacgsmith]

@andrewfullard and @marxwillia can we hold off on merging this until next week -- I would like some more people to read through it and give me some feedback because I am sure there are things on this page that should be improved.

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