docs(about us): add section about paid help

[HonkingGoose]

Changes

• Add section to About Us page about getting more paid help

Context

We recently created a Code of Conduct, where we explain how users can get more paid help:

renovate/CODE_OF_CONDUCT.md

Lines 93 to 100 in 9e2ca6b

	## Getting more help
	If you need more assistance than what this project offers, you have two options:
	1. Become a Mend.io customer, such as by buying Renovate Enterprise, or
	1. Hire an experienced Renovate contributor privately for consulting. Mend.io staff do _not_ offer this service, but one of our volunteer maintainers, [`@secustor`](https://github.com/secustor), does
	## Feedback

I want to have this info in the published docs as well, that way users can search for it, and stumble upon it. I guess most users ignore Code of Conducts. 🙃

Possible locations to put this info

• In the About Us page
• In the FAQ
• Somewhere else

Let me know if I need to move the info somewhere else.

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[renovate-release]

🎉 This PR is included in version 37.381.8 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 37.381.8

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