Complete Arch Linux installation and SSH setup

- Mark Arch Linux installation as completed on ThinkPad
- Configure SSH access with hostname resolution (homelab)
- Add comprehensive SSH setup guide with security hardening
- Document network planning and self-hosted services options
- Update progress tracking in README and installation notes

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Co-Authored-By: Claude <noreply@anthropic.com>

README.md

@@ -4,8 +4,8 @@
 Setting up a personal homelab using a ThinkPad laptop running Arch Linux to move away from cloud providers like Google.
 
 ## Goals
-- [ ] Linux installation (Arch Linux on ThinkPad)
-- [ ] SSH remote access
+- [x] Linux installation (Arch Linux on ThinkPad)
+- [x] SSH remote access (hostname: homelab)
 - [ ] Network domain setup
 - [ ] Self-hosted cloud storage (ownCloud/Nextcloud)
 - [ ] Self-hosted git repository (Gitea/Forgejo/GitLab)
@@ -20,5 +20,6 @@ Setting up a personal homelab using a ThinkPad laptop running Arch Linux to move
   - Need to collect tips and inspiration from this video
 
 ## Current Status
-- Downloading Arch Linux ISO
-- Planning initial setup phase
+- ✅ Arch Linux installed on ThinkPad
+- ✅ SSH access configured (accessible as `homelab`)
+- Next: Set up dotfiles and begin service planning