Docs fix windowsperf installation guide

[PrzemekWirkus]

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PR Description: This pull request includes several updates to the WindowsPerf documentation to enhance clarity, usability, and accuracy. The changes are as follows:

• Fixed typos and removed incomplete sentences.
• Updated the "Install WindowsPerf Virtual Studio Extension" section with detailed VS Extension installation instructions.
• Improved the overall project description for better understanding.
• Removed instructions for installing/removing the devcon tool, as wperf-devgen is now the preferred tool.
• Added a "Further reading" section for WindowsPerf and its GUI, including relevant blogs.
• Updated the project homepage to the Arm GitHub.
• Fixed the header for the VS Code extension.
• Moved the "Install VS Code Extension" section to the end of the guide for better flow.

These updates aim to provide a more comprehensive and user-friendly guide for users of the WindowsPerf tool.

Let me know if you need any further adjustments!

Fixes: arm-developer-tools/windowsperf#9

[PrzemekWirkus]

@RonanSynnottArm FYI