chore(secrets): rotate secrets, purge history, and add placeholders

docs/shell-standard.md

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+# Shell Standardization Plan
+
+To ensure a consistent development environment across local machines and remote servers (within the satware AG infrastructure), we are standardizing on `bash` with `starship` as the prompt.
+
+## Deployment Guide
+
+### Prerequisites
+- Access to the target environment.
+- `curl` installed (for prompt installation).
+
+### Execution
+Run the provided bootstrap script:
+
+```bash
+/path/to/inner/repo/scripts/bootstrap-shell.sh
+```
+
+### Manual Verification
+After running the script, initiate the shell switch:
+1. Ensure the new login shell is available in `/etc/shells` (if on Linux).
+2. Run `chsh -s /bin/bash`.
+3. Restart your terminal session.