remove all useless header comments (#3363)

see #3358

used command: `find ./ -type f -exec perl -i -0pe
's/\/\*\s*magicmirror.*?\*\/\s*//si' {} \;`

This is a first draft, I think we should preserve some of the comments.

CHANGELOG.md

@@ -34,6 +34,8 @@ _This release is scheduled to be released on 2024-04-01._
 
 ### Deleted
 
+- Unneeded file headers (#3358)
+
 ## [2.26.0] - 01-01-2024
 
 Thanks to: @bnitkin, @bugsounet, @dependabot, @jkriegshauser, @kaennchenstruggle, @KristjanESPERANTO and @Ybbet.