Update welcome banner

[mrtomeq]

Update welcome banner to show warning if kensobi token is not provided.
Possible card: https://developers.grafana.com/ui/latest/index.html?path=/story/general-card--with-actions

Text: Your organization is currently unverified. To unlock the benefits of the KensoBI Cloud Free Tier, please take a moment to verify your organization. No credit card is required for this process.

Verification Benefits:

• Access to all KensoBI plugins
• 1 GB database to store your measurement data
• Access to Measurement Streaming Service

[button link] -> http://kensobi.com/verify-org

[christomecki]

Check it out: 4b31ce9

[mrtomeq]

It needs to be bolder, like a warning message. I like this info box but it is depreciated. We deficiently need a better button - either primary or warning.
I also got popup warning about plugin not found. Appears to be related to this token check,

[christomecki]

I managed to hide the warning popup for token/plugin error. I changed the UI and now it uses the <Alert> component. But it looks quite different than the one in Grafana Storybook. Maybe versions are slightly different.

The changes are here: 59e4262
I think I just paste here how it looks right now.