Community templates

[RinkiyaKeDad]

Fix for #2086

Types of changes

What types of changes does your code introduce to Graphback?

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)
• Other (please specify)

Checklist

• I have read the CONTRIBUTING document.
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

I've added the changes from both mine and @wtrocki's PR to this one. The current status is:

1. There is a community-templates.ts file present in the packages directory.
2. This file contains an externalTemplates array where people can add their template as an object.
3. The externalTemplates array gets imported into the starterTemplates.ts file where templates from it get added to the allTemplates array.
4. Made changes to the way few things were imported in different files as they were giving errors in previous PR. (this might not be needed now)
5. Added a draft of the documention which will be changed based on suggestions.

Please let me know if you have any suggestions and what further steps I should take. Much thanks.

[wtrocki]

Amazing job. I will look into why build is failing

[wtrocki]

Suggested change

	In case you want to use some other templates than the ones offered, Graphback also supports adding your templates. The process is fairly simple and is as follows:
	Graphback has ability to include community templates. To add community template please:

[wtrocki]

I need to rebase and squash this work in order to get this working