docs: add self-hosting guide for Tux with Docker and Postgres

[electron271]

Summary by Sourcery

Documentation:

• Document how to self-host Tux with Docker and Postgres.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds a new self-hosting guide for Tux that details how to deploy using Docker Compose and Postgres. The guide outlines prerequisites, installation steps, and troubleshooting tips.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Addition of the self-hosting guide document.	Created a new documentation file that explains how to set up self-hosting for Tux. Outlined prerequisites including Docker, Docker Compose, Postgres database, Discord bot token, and optional Sentry URL. Provided step-by-step installation instructions including repository cloning, environment configuration, starting the bot via Docker Compose, checking logs, pushing the database schema with Prisma, and verifying system functionality.	docs/self-hosting.md

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[sourcery-ai]

Hey @electron271 - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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