Migration fix-ups in https://maplibre.org/maputnik

[zstadler]

Maputnik version: v2.0.0-pre.2
Browser: All
OS: All

Description of the bug:
Fix some issues related to the migration from https://maputnik.github.io/editor to https://maplibre.org/maputnik

• Broken icon in top-left corner
  
• Maputnik link points to https://maputnik.github.io/editor and relies on the redirection
  
• Help link points to https://github.com/maputnik/editor/wiki and relies on the redirection
  
• Remove broken survey
  

[HarelM]

Any chance you can check which was solved as part of the following PR:
#860
I see that the icon is still an issue, not sure about the rest.

[zstadler]

Yes. The missing icon is the only missing part.