Reduce size of this repo

[AtmaMani]

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Discussing this topic on the public repo, so users can be aware of upcoming changes to the content structure

Is your feature request related to a problem? Please describe. This public repository is now 5.4GB in size. An enormous size like this leads to a poor user experience when new users clone it, bloating of ArcGIS Docker Image and degraded performance for internal build systems. This issue proposes the following changes to reduce the repository size.

Total size:

(base) ➜  arcgis-python-api git:(master) du -hcs .
5.4G	.
5.4G	total

Size by subfolder:

(base) ➜  arcgis-python-api git:(master) du -hs * | sort -rg  
639M	apidoc
467M	samples
292M	static
285M	guide
244K	misc
 76K	items_metadata.yaml
 16K	tools
 16K	notebooks
 12K	update_items.py
 12K	LICENSE
6.2M	labs
4.0K	environment.yml
4.0K	README.md
4.0K	PULL_REQUEST_TEMPLATE.md
4.0K	CONTRIBUTING.md
4.0K	CODE_OF_CONDUCT.md

Describe the solution you'd like We could do a combination of a few things to reduce the size:

Short term

• [ ] Delete stale branches. Actively delete branches once changes are merged. This should improve performance on new clones.
• [ ] Move API ref files to a public file share. Needs to be explored
• [ ] Introduce a 'Download' button on the API ref hosting site which allows users to download an archive of the API ref.

Long term

• [ ] Edit notebooks that reference data from a local ./data folder such that they publish data as an Item on AGO and download and use it locally.
• [ ] Edit .gitignore to ignore such local download / scratch folders.