Shorten administrator URL

[philipphenkel]

The administrator URL contains the content and is quite long. Compress the content so that URL gets shortened.

Example for a blank board it is http://localhost:3000/board/3302ea6e-52b3-4bcd-88e8-8d23c76d52bb/JTdCJTIycm9sZSUyMiUzQSUyMmFkbWluJTIyJTJDJTIybGFuZ3VhZ2UlMjIlM0ElMjJqc29uJTIyJTJDJTIyY29udGVudCUyMiUzQSUyMiU1Q24lNUNuJTVDbiU1Q24lNUNuJTVDbiU1Q24lNUNuJTVDbiU1Q24lNUNuJTVDbiU1Q24lNUNuJTIyJTdE