Add content to our documentation

Theodolite's documentation lives inside the docs folder. It is available at https://cau-se.github.io/theodolite/ but does not provide much content yet.

This ticket summarizes what eventually should be contained in the docs. We might need to create separate sub tickets.

• Home (!164 (merged), !221)
• Getting Started (!164 (merged))
• Fundamental Concepts (!205 (merged))
  • Theodolite Benchmarking Method (!205 (merged))
    • Metrics (!205 (merged))
    • Search Heuristics etc. (!205 (merged))
  • Role and Data Model
  • Operator
• Installation (!164 (merged))
• Running Benchmarks (!164 (merged))
  • Creating Executions (!164 (merged))
  • Working with the Dashboard
  • Analysis
    • Installation
    • Working with the Notebooks
• Creating Benchmarks (!164 (merged))
• Available Benchmarks (!204 (closed))
  • Description of Benchmarks (Use Cases) #40 (closed)
• Development
  • Add additional benchmarks/stream processing engines (?)
  • Architecture (?)
  • Developing locally (?)
  • Release process
• API Reference
  • CRDs
  • Patchers
• Publications (#262 (closed), !290 (merged))
• Contributors (!290 (merged))