Update authentication.md

[dasunsrule32]

Category:

Documentation

Overview

Add authentik specific documentation to get OIDC configured with Dashy.

Issue Number (if applicable) #1664

New Vars (if applicable)

N/A

Screenshot (if applicable)

N/A

Code Quality Checklist (Please complete)

• [x] All changes are backwards compatible
• [x] All lint checks and tests are passing
• [x] There are no (new) build warnings or errors
• [x] (If a new config option is added) Attribute is outlined in the schema and documented
• [x] (If a new dependency is added) Package is essential, and has been checked out for security or performance
• [x] (If significant change) Bumps version in package.json

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[dasunsrule32]

You're welcome 🙂

[dasunsrule32]

You're welcome. I figured it would help others, so why not. 🙂