docs(self-hosted): Update Readme

[charliedmcb]

Fixes #

Description Updating the readme for self-hosted install using helm.

How was this change tested? Ran through the steps myself in a free environment. *

Does this change impact docs?

• [x] Yes, PR includes docs updates
• [ ] Yes, issue opened: #
• [ ] No

Release Note

NONE

[coveralls]

Pull Request Test Coverage Report for Build 11674433612

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.005%) to 94.234%

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Totals
Change from base Build 11563969115:	0.005%
Covered Lines:	37149
Relevant Lines:	39422

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💛 - Coveralls