## What changed?
<!-- Describe what has changed in this PR -->

A refresh of our README.

| Before | After |
|--------|--------|
| <img width="919" alt="Screenshot 2025-04-07 at 2 48 07 PM"
src="https://github.com/user-attachments/assets/92485c3d-770a-493d-86a3-ca2331d19a55"
/> | <img width="929" alt="Screenshot 2025-04-07 at 2 49 21 PM"
src="https://github.com/user-attachments/assets/f0dc4b4f-4a6f-4037-b789-a0fa027901b6"
/> |
 
[See it
here](https://github.com/stephanos/temporal/tree/readme-refresh).

## Why?
<!-- Tell your future self why have you made these changes -->

I saw the https://github.com/jj-vcs/jj README and felt our README could
learn a thing or two from that one.

## How did you test it?
<!-- How have you verified this change? Tested locally? Added a unit
test? Checked in staging env? -->

## Potential risks
<!-- Assuming the worst case, what can be broken when deploying this
change to production? -->

## Documentation
<!-- Have you made sure this change doesn't falsify anything currently
stated in `docs/`? If significant
new behavior is added, have you described that in `docs/`? -->

## Is hotfix candidate?
<!-- Is this PR a hotfix candidate or does it require a notification to
be sent to the broader community? (Yes/No) -->