feat: Major updates to backend structure and security enhancements

- Removed `COMMON_ERRORS.md` file to streamline documentation.
- Added `Flask-Limiter` for rate limiting and `redis` for session management in `requirements.txt`.
- Expanded `ROADMAP.md` to include completed security features and planned enhancements for version 2.2.
- Enhanced `setup_myp.sh` for ultra-secure kiosk installation, including system hardening and security configurations.
- Updated `app.py` to integrate CSRF protection and improved logging setup.
- Refactored user model to include username and active status for better user management.
- Improved job scheduler with uptime tracking and task management features.
- Updated various templates for a more cohesive user interface and experience.

backend/app/node_modules/lines-and-columns/README.md

@@ -0,0 +1,33 @@
+# lines-and-columns
+
+Maps lines and columns to character offsets and back. This is useful for parsers
+and other text processors that deal in character ranges but process text with
+meaningful lines and columns.
+
+## Install
+
+```
+$ npm install [--save] lines-and-columns
+```
+
+## Usage
+
+```js
+import { LinesAndColumns } from 'lines-and-columns'
+
+const lines = new LinesAndColumns(
+  `table {
+  border: 0
+}`
+)
+
+lines.locationForIndex(9)
+// { line: 1, column: 1 }
+
+lines.indexForLocation({ line: 1, column: 2 })
+// 10
+```
+
+## License
+
+MIT