Docs: Improve TechDocs example documentation component

[OrkoHunter]

Feature Suggestion

Backstage mono-repo comes with an example component for TechDocs. It is located here
https://github.com/backstage/backstage/tree/master/plugins/techdocs-backend/examples/documented-component
and is loaded into the app from here

backstage/app-config.yaml

Lines 207 to 209 in c3ea694

	# Example component for TechDocs
	- type: file
	target: ../../plugins/techdocs-backend/examples/documented-component/catalog-info.yaml

This component should be an exhaustive display of all the features that TechDocs/MkDocs provides.

Possible Implementation

• Add few more sub pages.
• Use one image and refer into markdown as relative path.
• Load an external image using URL.
• Look at the MkDocs extension that comes with mkdocs-techdocs-core and add a section in a page for each.

Context

Essentially we want this component for two use-cases

1. Display most of the features
2. Use as a place to test new implementations and making sure it doesn't break any of these plugins. (Will follow up with regression tests after the component is improved)

[OrkoHunter]

Assigned it to you! Ask here or drop by on Discord's #docs-like-code channel if you need any help.

[OrkoHunter]

@Aiwwa I can't see your comment anymore hence, marking this issue up for grabs. Let us know if you're still working on it.