Handbook: Update README.md (#15052)

Set @3KindsofFish as the DRI on the demand gen departmental page.

# Checklist for submitter

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

<!-- Note that API documentation changes are now addressed by the
product design team. -->

- [ ] 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 permissions changes (docs/Using
Fleet/manage-access.md)
- [ ] 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)).

handbook/demand/README.md

@@ -175,5 +175,5 @@ When a community member has a question about getting started with Fleet, they ca
 <!-- TODO: Explore the stubs from this: https://gist.github.com/mikermcneil/d8ffd8849a5e9da722448c9712b1e9c0 -->
 <!-- TODO: Slightly later, in another PR, finish processing this: https://gist.github.com/mikermcneil/d8ffd8849a5e9da722448c9712b1e9c0 -->
 
-<meta name="maintainedBy" value="mikermcneil">
+<meta name="maintainedBy" value="3kindsoffish">
 <meta name="title" value="🫧 Demand">