Reordering chapters

[elarlang]

To have some future step happening faster - we need to think about the order for the chapters.

Proposal for some kind of grouping and order:

V11 Business Logic
V5 Validation, Sanitization and Encoding

V2 Authentication
V3 Session Management
V4 Access Control

V50 Web Frontend Security
V13 API and Web Service
V52 Self-contained Tokens
V51 OAuth and OIDC

V6 Cryptography
V8 Data Protection
V9 Secure Communication

V10 Secure Coding Architecture and Implementation
V12 File and Resources - some sections are fitting to be next to input validation, some with next to configuration
V7 Security Logging and Error Handling
V14 Configuration

V53 WebRTC