Update "Which figma file should I use?" to reflect future Figma structure (#12616)

…ture

# Checklist for submitter

If some of the following don't apply, delete the relevant line.

- [ ] Changes file added for user-visible changes in `changes/` or
`orbit/changes/`.
See [Changes
files](https://fleetdm.com/docs/contributing/committing-changes#changes-files)
for more information.
- [ ] Documented any API changes (docs/Using-Fleet/REST-API.md or
docs/Contributing/API-for-contributors.md)
- [ ] Documented any permissions changes
- [ ] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements)
- [ ] Added support on fleet's osquery simulator `cmd/osquery-perf` for
new osquery data ingestion features.
- [ ] Added/updated tests
- [ ] Manual QA for all new/changed functionality
  - For Orbit and Fleet Desktop changes:
- [ ] Manual QA must be performed in the three main OSs, macOS, Windows
and Linux.
- [ ] Auto-update manual QA, from released version of component to new
version (see [tools/tuf/test](../tools/tuf/test/README.md)).

---------

Co-authored-by: Sampfluger88 <108141731+Sampfluger88@users.noreply.github.com>

handbook/marketing/README.md

@@ -294,7 +294,8 @@ We use Figma for most of our design work. This includes the Fleet product, our w
 
 ##### Which file should I use?
 
-**Fleet product** All product design work is done in the [Fleet EE (scratchpad)](https://www.figma.com/file/hdALBDsrti77QuDNSzLdkx/%F0%9F%9A%A7-Fleet-EE-(dev-ready%2C-scratchpad)?node-id=9209%3A302838) Figma doc. Check out the [README](https://www.figma.com/file/hdALBDsrti77QuDNSzLdkx/%F0%9F%9A%A7-Fleet-EE-(dev-ready%2C-scratchpad)?node-id=2750%3A67203) for how to use this doc.
+**Fleet product.** All product design work is done in the [Fleet product](https://www.figma.com/files/project/17318630/%F0%9F%94%9C%F0%9F%93%A6-Fleet-EE%C2%AE-(product)?fuid=1234929285759903870) Figma project.  
+See [📖Product#Working with Figma](https://fleetdm.com/handbook/product#working-with-figma) for more details.
 
 **Fleet website.** All website design work is done in the [fleetdm.com (current, dev-ready)](https://www.figma.com/file/yLP0vJ8Ms4GbCoofLwptwS/%E2%9C%85-fleetdm.com-(current%2C-dev-ready)?node-id=794%3A373) Figma file.