docs: Add dnf installation step

[gursewak1997]

Now that we have bcvk in testing/stable for Fedora 42+ and EPEL9/10, we can add the installation process with dnf.
Package: https://koji.fedoraproject.org/koji/packageinfo?packageID=43081

[gemini-code-assist]

Code Review

This pull request adds a helpful section to the installation documentation for users who can install bcvk via dnf. My review includes a suggestion to add a note about runtime prerequisites to ensure users have a smooth setup process.

[gemini-code-assist]

This is a great addition to the documentation. To improve the user experience, it would be helpful to explicitly mention that there are runtime prerequisites that need to be installed separately, as the dnf package does not seem to include them as dependencies. This will help prevent users from running into issues after installation.

Suggested change

	## From Packages
	bcvk is available in Fedora 42+ and EPEL 9/10:
	```bash
	sudo dnf install bcvk
	```
	## From Packages
	bcvk is available in Fedora 42+ and EPEL 9/10:
	```bash
	sudo dnf install bcvk

After installing, ensure you have the necessary runtime prerequisites like QEMU/KVM and Podman.

[cgwalters]

After installing, ensure you have the necessary runtime prerequisites like QEMU/KVM and Podman.

Well we messed this up, we should add those to the spec file...

[gursewak1997]

Ah well, open a new PR for that:/

[gursewak1997]

#207 merged now

[gursewak1997]

This can be merged now.