Replace episode framing with homelab guides

[keepittechie]

Summary

• Renamed episode companion pages to homelab guides
• Replaced video/episode framing with repo-focused guide language
• Replaced the YouTube series page with learning paths
• Updated links across README, docs, and service pages
• Kept the repo focused on homelab setup, architecture, examples, and replication guidance

Safety Review

• Markdown link check passed
• Diagram structure check passed
• Public-safety scan passed
• git diff --check passed
• Episode/video framing scan returned clean
• Private domain scan returned clean
• Personal path/email scan returned clean
• Private-language scan returned clean
• No screenshots, exact host IPs, private domains, raw exports, credentials, or private data were added

Notes

This keeps the repo focused as a public-safe homelab documentation and replication resource. Wiki, blog, and videos can handle separate content workflows.