Documentation updates

[marcverhagen]

Updates needed on:

• [x] New document structure approach, includes changes to preprocessor, evita and slinket sections
• [ ] Add notes on evaluation
• [ ] TarsqiWrapper has replaced run_tarsqi()
• [ ] Add S2T section
• [ ] Add Blinker section
• [ ] Add Classifier section
• [ ] Add SputLink section, should also show how SputLink is used by merging and future components