Auto merge of #29903 - mrobinson:improve-windows-build-instructions, r=mrego

Simplify the build instructions in README.md

- Add a chocolatey configuration that installs all dependencies and split
  the instructions into a normal and manual installation section. In
  addition fix a warning print statement for the Windows build that would
  trigger a Python exception.
- Simplify the build instructions in the README and move all manual
  setup details to: https://github.com/servo/servo/wiki/Building

<!-- Please describe your changes on the following line: -->

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes do not require tests because they do not change behavior.

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

python/servo/command_base.py

@@ -1067,8 +1067,8 @@ def find_highest_msvc_version():
 
     versions = sorted(find_highest_msvc_version_ext(), key=lambda tup: float(tup[1]))
     if not versions:
-        print("Can't find MSBuild.exe installation under %s. Please set the VSINSTALLDIR and VisualStudioVersion"
-              + " environment variables" % base_vs_path)
+        print(f"Can't find MSBuild.exe installation under {base_vs_path}. "
+              "Please set the VSINSTALLDIR and VisualStudioVersion environment variables")
         sys.exit(1)
     return versions[0]