Add a "help" dialog

[Akeboshiwind]

There should be a ? or help button in the navbar that opens a popup that explains xt fiddle, links to docs & examples and things.

---

Rough content:

Welcome to xt-fiddle, a playground for xtdb.

Usage

Below the navbar you'll see two panels: transactions and query

In the transactions panel you can write colon (;) separated transactions that will all be executed at the same system time.
To execute transactions at a different or multiple system times then click the + button and adjust the date above each panel.
Make sure that each system time is greater or equal to the previous one, just like when you execute transactions in real time!

In the query panel you can write a single query after all the transactions have been run.

You can use the run button to execute the transactions then run the query.

Share your current state by clicking the save as url button then share the generated url.

Examples

• some
• list
• of
• examples?

Docs

Maybe this should be higher up?

Something not working as you expect with the fiddle? Open an issue here.

Found a bug in xtdb? Open an issue here.