docs: Template the README file

[mrueg]

What this PR does / why we need it:
This is an alternative for automating releases further instead of a bashscript.
It would create an updated readme file based on the content in the data.yaml via
gomplate -d config=./data.yaml --file README.md.tpl > README.md

• Needs CI Integration / Fail if README.md is outdated
• Needs header in README.md that changes need to be made in the template file

How does this change affect the cardinality of KSM: (increases, decreases or does not change cardinality)
None
Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

/assign @rexagod

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[mrueg]

@rexagod @dgrisonnet this is now ready for review and should simplify the release process a bit.

[rexagod]

Whoa! This looks great, and I'm fairly confident it'll be able to handle various templating cases we throw at it with cleanliness, not to mention unblocking us on the release-automation front! Nicely done! 🙌🏼

[mrueg]

@rexagod great to hear, if there are no concerns with this approach, this is ready to go :)

[rexagod]

Suggested change

	> This README is generated from [./README.md.tpl]. Please make changes in the template file.
	> This README is generated from [./README.md.tpl](./README.md.tpl). Please make changes in the template file.

Ah, just a nit. We might need to append the path here, not sure if it is hyperlinked currently (Goland keeps telling me otherwise).

[rexagod]

/lgtm

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