Docs: Add redis docs, fix existing pipeline docs, add unlinked file

[sebix]

• docs: add redis docs: used dbs, setup tips
  which redis db is used by what
  which databases are available, what's the limit
  mention memory overcommitting and maxmemory settings
• docs: pipeline configration fixes
  fix links
  add sections
  add missing types and default values
  add missing typing hints to Amqp pipeline class
• docs: add unlinked intelmqctl docs to tree