Included pip & venv based instructions for WSL2 (#812)

[JurgenZach-NOAA]

Possible Cython compile errors in T-route caused by PR784 (#784) have resulted in a recommendation to compile in "no-editable' mode (PR 801, #801). The no-e option, in turn, has resulted in the necessity to recompile T-route after each edit of python code.

The instructions provided here showcase how T-route can be installed in a manner compatible with PR 784 while avoiding the non-editable compile option. It is based on pip and venv, avoiding conda altogether. It has been implemented on WSL, but should be readily adaptable to the same recent long-term stable Ubuntu distros (22.04 and 20.04).

[Short description explaining the high-level reason for the pull request]

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Checklist

• PR has an informative and human-readable title
• Changes are limited to a single goal (no scope creep)
• Code can be automatically merged (no conflicts)
• Code follows project standards (link if applicable)
• Passes all existing automated tests
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future todos are captured in comments
• Visually tested in supported browsers and devices (see checklist below 👇)
• Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)
• Reviewers requested with the Reviewers tool ➡️

Testing checklist

Target Environment support

• Windows
• Linux
• Browser

Accessibility

• Keyboard friendly
• Screen reader friendly

Other

• Is useable without CSS
• Is useable without JS
• Flexible from small to large screens
• No linting errors or warnings
• JavaScript tests are passing