Update README for PowerToys 0.102 (#51396)

<!-- Enter a brief description/summary of your PR here. What does it
fix/what does it change/how was it tested (even manually, if necessary)?
-->
## Summary of the Pull Request

Updates the README for the PowerToys 0.102 release by:

- Replacing the What's new banner with the 0.102 release artwork
- Updating the roadmap for v0.103: a new Awake flyout, Screen Ruler
improvements, and continued WinUI 3 modernization of utilities

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## PR Checklist

- [ ] Closes: #xxx
<!-- - [ ] Closes: #yyy (add separate lines for additional resolved
issues) -->
- [x] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

<!-- Provide a more detailed description of the PR, other things fixed,
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

`doc/images/readme/Release-Banner.png` is replaced with the supplied
1200×252 PowerToys 0.102 artwork (same dimensions as the previous
banner). The roadmap now links to the [PowerToys 0.103
milestone](https://github.com/microsoft/PowerToys/milestone/47). The
utilities table is unchanged because the new Mouse Button Lock and
CursorHide utilities are part of Mouse Utilities.

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

- `Get-FileHash` comparison: the committed banner matches the supplied
image exactly (passed); dimensions confirmed at 1200×252
- `Invoke-WebRequest -Method Head
https://github.com/microsoft/PowerToys/milestone/47`: returned 200
(passed)
- `git diff --check`: no whitespace errors (passed)

Documentation and image-only change; automated tests are not applicable.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: b1b02d2d-b163-46ea-972d-dc623debc895

README.md

@@ -97,7 +97,7 @@ To see what's new, check out the [release notes](https://github.com/microsoft/Po
 
 ## 🛣️ Roadmap
 
-For [v0.102][github-next-release-work], we're working on modernizing several utilities with WinUI 3, expanding Command Palette with tabs and JavaScript/TypeScript extensions, and adding new productivity improvements across PowerToys.
+For [v0.103][github-next-release-work], we're working on a new Awake flyout, improving Screen Ruler, and continuing to modernize more utilities with WinUI 3.
 
 ## ❤️ PowerToys Community
 
@@ -118,4 +118,4 @@ The application logs basic diagnostic data (telemetry). For more privacy informa
 [oss-CLA]: https://cla.opensource.microsoft.com
 [oss-conduct-code]: CODE_OF_CONDUCT.md
 [community-link]: COMMUNITY.md
-[github-next-release-work]: https://github.com/microsoft/PowerToys/milestone/46
+[github-next-release-work]: https://github.com/microsoft/PowerToys/milestone/47