Add template source docs

[komalali]

trafficstars

Proposed changes

Fixes https://github.com/pulumi/pulumi-service/issues/28417

Unreleased product version (optional)

Related issues (optional)

[pulumi-bot]

Your site preview for commit a4affca8 is ready! :tada:

http://www-testing-pulumi-docs-origin-pr-15040-a4affca8.s3-website.us-west-2.amazonaws.com.

[jkodroff]

@komalali IDK if a git was able to recognize a proper git mv, but the file in question is now at: https://github.com/pulumi/docs/tree/master/content/docs/pulumi-cloud/reference/deployments