Add configuration to disable write actions

[feedmeapples]

What was changed

Adds config that disables write actions

Why?

Allows to disable Terminate button and other actions

Checklist

1. Closes

2. How was this tested:

curl http://localhost:8080/api/v1/settings                                                                                                                                                             

{"Auth":{"Enabled":false,"Options":["audience","organization","invitation"]},"DefaultNamespace":"default","ShowTemporalSystemNamespace":false,"FeedbackURL":"","NotifyOnNewVersion":true,"Codec":{"Endpoint":"","AccessToken":""},"Version":"2.3.0","DisableWriteActions":false}

3. Any docs updates needed?

[feedmeapples]

resolved in #194