docs: update the brew installation path (#109)

[andrinoff]

No description provided.

[Copilot]

Pull request overview

This pull request updates the Homebrew installation documentation for Matcha. It corrects the brew install command to use the full tap path and adds a warning about a potential naming conflict with another package.

Changes:

• Updated brew install command to use the fully qualified path floatpane/matcha/matcha
• Added a WARNING callout alerting users about potential naming conflicts with another Matcha package

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

The warning message is incomplete. It states that the executable will have to be renamed but doesn't provide any instructions on how to rename it or what to rename it to. Users encountering this conflict will need guidance on the actual steps to resolve the issue.

Suggested change

	> If you have the [*"other"* Matcha](https://github.com/piqoni/matcha) already installed, you will have to rename the executable
	> If you have the [*"other"* Matcha](https://github.com/piqoni/matcha) already installed, you will have to rename its executable to avoid a name clash with this tool.
	> For example, you can locate the existing executable and rename it to `matcha-piqoni`:
	>
	> ```bash
	> # Find the existing "matcha" executable
	> which matcha
	>
	> # Rename it (adjust the path from `which` if different)
	> sudo mv "$(which matcha)" /usr/local/bin/matcha-piqoni
	> ```
	>
	> After that, you can run this Matcha as `matcha`, and the other one as `matcha-piqoni`.