use locks yml on rtd

[bjlittle]

🚀 Pull Request

Description

This pull-request uses the explicit YAML file equivalent of the conda-lock environment file on readthedocs to build the conda environment.

Roughly, the major costs of building the documentation on readthedocs are:

• the mamba env create task, which takes ~370 seconds
• the python -m sphinx task, which takes ~290 seconds

This pull-request reduces the mamba env create task by ~40 seconds.

There can be large differences in runtime when building the documentation as we don't have any dedicated resource on the readthedocs server. How quickly our requests are serviced is affected by community demand. So the above values are speculative at best, and based on a small sample of job runs.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (1765802) 94.65% compared to head (91371f7) 94.65%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #688 +/- ## ======================================= Coverage 94.65% 94.65% ======================================= Files 129 129 Lines 4900 4900 ======================================= Hits 4638 4638 Misses 262 262 ```

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[trexfeathers]

Thanks so much for giving this a go, @bjlittle!