Add "Recipes" section to docs

[dankochetov]

• [ ] Conditinally add query parts (join, limit, order by etc.)
• [ ] Conditional field selection
• [ ] Dynamic field selection (user-provided fields)
• [ ] Table self-reference
• [ ] Tables circular reference
• [ ] Using subqueries inside the view query
• [ ] How to pass around the table reference
• [ ] Partially reusing queries (extracting different query parts outside of the query)
  • [ ] extracting conditions (.where(), .having(), on clause etc.)
  • [ ] extracting field selection (.select())
  • [ ] extracting insert/update values