Add new images and documentation updates; remove sensitive files

- Added new images related to architecture and development.
- Updated paths in various markdown files to correct resource locations.
- Created new markdown files for Python development topics.
- Deleted outdated and sensitive files, moving them to a secure archive.
- Added a README for the security-sensitive files archive with recommendations for handling sensitive information.

400-archive/security-sensitive/README.md

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+# Security-Sensitive Files Archive
+
+⚠️ **WARNING**: This folder contains files with exposed credentials and API keys.
+
+## Archived Files
+
+These files were moved from `300-resources/` during the 2025-12-29 refactoring because they contain sensitive information that should not be stored in plain text:
+
+1. **Apple App Password.md** - Email credentials
+2. **Matrix Server.md** - Azure and Flexify API keys
+3. **Cookies.md** - Session tokens
+4. **Domains.md** - Domain registrar information
+
+## Recommendation
+
+Consider:
+- Moving credentials to a password manager (1Password, Bitwarden, etc.)
+- Using encrypted storage (encrypted vault, keychain)
+- Deleting these files after securely storing credentials elsewhere
+- Adding `400-archive/security-sensitive/` to `.gitignore` if syncing to cloud
+
+## Safety Note
+
+Do not commit this folder to public repositories or sync to unsecured cloud storage.