Add Flagd-ui to demo docs

[maindotmarcell]

Changes

Changes required for the documentation concerning the flagd-ui feature.

As we have a ready PR for the first version of the flagd-ui, we would like to start thinking about how this new feature can be included in the documentation. Below you can find what I've implemented in this PR as my suggestions:

• Screenshots -> Add screenshots of the UI
• Docker deployment -> Add :8080/feature route
• Kubernetes deployment -> Add :8080/feature route
• Feature flags page -> Mention the possibility to toggle the flags through the UI
• Requirements/architecture -> mention under feature flagging section

As it is not directly a microservice of the astronomy shop app, but it is an instrumented service nonetheless, there a few where it might make sense to include it (the flagd service itself is currently not included in these):

• Architecture charts
• List of Services

Additionally it might make sense to create a separate docs page for this feature at some point.

Thank you in advance for reviewing! 🚀

Let me know if I missed anything :)

[svrnm]

Thank you, I commented with a few change requests

[maindotmarcell]

Thank you, I commented with a few change requests

@svrnm Thank you for the review, I've applied the suggested changes in the last commit

[svrnm]

Thank you, I commented with a few change requests

@svrnm Thank you for the review, I've applied the suggested changes in the last commit

thanks!

@open-telemetry/demo-approvers please take a look!

[julianocosta89]

LGTM, we just need to get the Helm chart PR merged before merging this one to avoid user's confusion.

Also, could you add the flagd-ui to the architecture page?
https://github.com/open-telemetry/opentelemetry.io/blob/main/content/en/docs/demo/architecture.md

I have it updated here if you would like: mermaid.live

[julianocosta89]

One minor suggestion, renaming the title and moving the initial sentence.

[julianocosta89]

LGTM, just waiting on open-telemetry/opentelemetry-helm-charts#1367

[svrnm]

LGTM, just waiting on open-telemetry/opentelemetry-helm-charts#1367

just let us know when that PR is merged so we can revisit this one! thanks!

[julianocosta89]

@svrnm this one should be good to go.
I've fixed the failing checks and that added some extra files to the PR (unrelated to the PR itself).
Happy to revert if that is not the way to do it.