Improve front-end course

training/front-end/06-front-end-development-practices.md

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+<!-- START doctoc generated TOC please keep comment here to allow auto update -->
+<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
+## Table of Contents
+
+- [Front-end development practices](#front-end-development-practices)
+  - [Testing](#testing)
+  - [Code style](#code-style)
+  - [Security](#security)
+  - [Dependency management: npm or yarn](#dependency-management-npm-or-yarn)
+
+<!-- END doctoc generated TOC please keep comment here to allow auto update -->
+
+# Front-end development practices
+
+## Testing
+
+## Code style
+
+## Security
+
+- CORS
+- XSS prevention
+- CSP
+
+## Dependency management: npm or yarn