add missing reference to example yaml files notebook, and clarify section about env update based on a config file

[emileten]

Clarifies the documentation explaining how to update environments

See #251

Adds a reference to the page with the example config files

In https://github.com/MAAP-Project/maap-documentation/pull/197/files I had changed the way we were pointing to example conda configuration files. The intent was to have a notebook showing the content of these files and having this notebook as a separate page of the docs, with the explanation page pointing to the latter page for examples.

I had forgotten to reference that examples page, so it's not showing up in the docs.

Fixing that here. See my screenshot.

[review-notebook-app]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB

[wildintellect]

Can you make it an internal page link?

[emileten]

@wildintellect :

• made an internal link to point to internal sections of the page
• I also replaced the quite messy approach of pointing to a notebook that prints yaml files. I removed that notebook, and instead I added links to download the yaml files themselves. This way, users don't have to copy paste from the notebook printed cells...

[wildintellect]

I'm ok with these changes as an improvement over the current. However I have questions about finding a better way to surface the yaml examples. Option include putting the yaml in code blocks and adding a copy button #256 , pushing users to clone the repo (or automatically including it in workspaces), redirecting users to the github repo folder, or the current where it just opens in the browser window for copy/paste.