Add comprehensive uninstall instructions to README

[rhatdan]

• Add detailed uninstall section covering all installation methods
• Document pip uninstall command
• Document Fedora DNF removal command
• Document macOS pkg uninstaller steps
• Add instructions for removing user data and configuration files
• Document locations of artifacts in home directory (~/.local/share/ramalama and ~/.config/ramalama)
• Update 'In development' section to reference new uninstall instructions

Fixes #2243

Summary by Sourcery

Document comprehensive uninstall procedures and data cleanup steps for RamaLama across supported installation methods.

Documentation:

• Add a dedicated uninstall section to the README covering pip, Fedora DNF, and macOS pkg installations, including removal of binaries, supporting files, and optional artifacts.
• Describe how to remove RamaLama user data and configuration directories, including large model data in the home directory.
• Update the development status section to reference the new uninstall documentation for resetting installations.

[sourcery-ai]

Reviewer's Guide

Adds a dedicated uninstall section to the README with concrete commands for pip, Fedora (DNF), macOS pkg installs, and user data cleanup, and updates the existing "In development" section to reference these centralized instructions instead of duplicating uninstall steps.

File-Level Changes

Change	Details	Files
Introduce a dedicated uninstall section documenting commands for different installation methods and user data cleanup locations.	Add pip-based uninstall instructions using pip uninstall ramalama. Add Fedora uninstall instructions using sudo dnf remove ramalama. Document macOS .pkg uninstall steps including removal of binaries, shared data, man pages, and shell completions under /usr/local. Add guidance for removing user data and configuration directories in the home directory, plus root-owned data under /var/lib/ramalama. Warn that the model data directory can be large and should be removed with care.	README.md
Refactor the existing "In development" section to rely on the new uninstall documentation instead of inline reset commands.	Remove inline commands for deleting /var/lib/ramalama and $HOME/.local/share/ramalama. Replace them with a reference link to the new uninstall section for full removal and cleanup instructions.	README.md

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#2243	Add clear uninstall instructions to the README that explain how to fully remove the software and its artifacts.	✅

Possibly linked issues

• Uninstall Instructions? #2243: PR implements the requested README uninstall instructions, covering package removal and data/config cleanup across platforms.

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[sourcery-ai]

Hey there - I've reviewed your changes - here's some feedback:

• For the macOS uninstall section, consider adding a brief note that the /usr/local/* paths may differ for users who installed to a custom prefix (e.g., via Homebrew or a non-default $PREFIX), so they know to adjust the paths rather than copy-pasting blindly.
• In the macOS uninstall snippet, you could reduce the risk of accidental copy-paste damage by grouping the optional rm commands behind a short explanatory paragraph or comment (e.g., “Run only those lines that match what you have installed”), making it clearer that not all lines will apply to every installation.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- For the macOS uninstall section, consider adding a brief note that the `/usr/local/*` paths may differ for users who installed to a custom prefix (e.g., via Homebrew or a non-default `$PREFIX`), so they know to adjust the paths rather than copy-pasting blindly.
- In the macOS uninstall snippet, you could reduce the risk of accidental copy-paste damage by grouping the optional `rm` commands behind a short explanatory paragraph or comment (e.g., “Run only those lines that match what you have installed”), making it clearer that not all lines will apply to every installation.

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[rhatdan]

@noahbliss PTAL

[rhatdan]

@olliewalsh @ieaves @engelmi @mikebonnet @bmahabirbu PTAL

[olliewalsh]

/retest ramalama-on-pull-request

[olliewalsh]

/retest bats-on-pull-request

[olliewalsh]

LGTM