User guide and UI changes

- first set of changes to the user guide, still missing updated images

- some UI changes to make the looks a bit more appealing
Small animation for the MISP logo
Merge branch 'hotfix-2.2.9'
Some UI changes and other minor changes

- images updated in user manual

- fixed validation issues with named pipe (at the moment it's very loose)

- Fixed an issue with shadow attriubutes not showing for events that have no attributes

- some minor UI changes to make MISP a bit prettier
Merge branch 'hotfix-2.2.9'