Redact personal data before publishing as public repo

- config/git/gitconfig: replace real name, email, SSH signing key, and
  self-hosted git credential URL with placeholder values

- stages/06-scripts.sh: remove hardcoded personal email from bw login;
  CLI prompts interactively

- config/shell/zshrc.local.example: replace personal server URLs
  (Nextcloud, LiteLLM proxy), university email address, institution-
  specific Canvas LMS URL, and identifying Canvas key prefix with
  generic example.com placeholders

- TODO.md: replace personal email and Nextcloud URL in code examples
  with generic placeholders

- stages/07-uv-projects.sh: remove private org name from comment

TODO.md

@@ -8,7 +8,7 @@ or hardware-specific configuration).
 - [ ] **Load SSH keys from Bitwarden** or generate a new key:
   ```bash
   # Option A: Generate fresh key
-  ssh-keygen -t ed25519 -C "hi@julianprester.com"
+  ssh-keygen -t ed25519 -C "your@email.com"
 
   # Option B: Set up Bitwarden+SSH loading
   bw login
@@ -22,7 +22,7 @@ or hardware-specific configuration).
 - [ ] **Add SSH public key to GitHub**: https://github.com/settings/keys
 - [ ] Clone this repo and remaining repos:
   ```bash
-  git clone git@github.com:julianprester/linux-provision.git
+  git clone git@github.com:yourusername/linux-provision.git
   ```
 
 ## 2. Bitwarden & Environment Variables
@@ -70,7 +70,7 @@ If you prefer a plain file instead of Bitwarden:
 ## 4. Nextcloud
 
 - [ ] Install Nextcloud Desktop Client (Flatpak or RPM)
-- [ ] Connect to `https://nc.julianprester.com`
+- [ ] Connect to your Nextcloud instance
 - [ ] Select sync folders (especially `Nextcloud/3_bibliography/`)
 - [ ] Update `PandocCiter.DefaultBib` in VS Code settings if bib path changes