feat: updating marketplace info and walkthrough

[angrycaptain19]

@Hellebore note - it'd be good to update the walkthrough to add a completion event for a review command being run as well

Summary by Sourcery

Update the documentation to reflect Sourcery's new role as a code reviewer and coding assistant, with a focus on providing code reviews directly in the IDE and integration with GitHub and GitLab. Enhance the walkthrough to guide users on utilizing these new features.

New Features:

• Introduce the ability for Sourcery to provide code reviews directly within the IDE, allowing users to get feedback on their code anytime.

Enhancements:

• Update the README and documentation to reflect the new capabilities of Sourcery, emphasizing its role as a code reviewer and coding assistant.
• Improve the walkthrough documentation to guide users on how to use Sourcery for code reviews in GitHub and GitLab repositories.

Documentation:

• Revise the README to highlight Sourcery's new features, including on-demand code reviews and integration with GitHub and GitLab.
• Add new documentation files to guide users on setting up Sourcery for GitHub and GitLab code reviews.
• Remove outdated documentation sections related to Sourcery CLI and pre-commit hooks.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates the marketplace information and walkthrough for Sourcery, focusing on code reviews and the coding assistant. The changes include updating the README, modifying the welcome file, adding a new file for GitHub code reviews, and removing some outdated files.

File-Level Changes

Change	Details	Files
Updated README to focus on code reviews and coding assistant features	Revised the introduction to emphasize code reviews and coding assistance Added sections for code reviews on demand and GitHub & GitLab PR reviews Removed sections on multi-file analysis, duplicate code detection, and Sourcery CLI Updated the order of features to prioritize code review functionality	README.md
Modified welcome-to-sourcery.py to highlight code review functionality	Rearranged the content to focus on code review features Added information about getting reviews on PRs in GitHub and GitLab Moved the example function to after the explanation of code review features	welcome-to-sourcery.py
Updated walkthrough files to reflect new focus on code reviews	Rewrote code_reviews.md to focus on in-IDE code reviews Updated view_welcome_file.md to introduce code review functionality Added github_code_reviews.md for GitHub and GitLab specific information Removed custom_rules_tutorial.md and refactoring_scan.md	walkthrough/code_reviews.md walkthrough/view_welcome_file.md walkthrough/github_code_reviews.md

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[sourcery-ai]

Hey @angrycaptain19 - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider retaining or updating the privacy/security section instead of removing it entirely, as this is important information for users.
• It might be helpful to briefly explain why certain features (like CLI and duplicate code detection) have been removed or de-emphasized, if that's the case.

Here's what I looked at during the review

• 🟢 Functionality: all looks good
• 🟡 General issues: 2 issues found
• 🟢 Security: all looks good
• 🟢 Review instructions: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟡 Documentation: 3 issues found

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[Hellebore]

Nice - looked like some useful review comments from sourcery there