Added skip silence hotkey

[SebiWrn]

Motivation and Context

Skip Silence should have a hotkey

Description

Added hotkey "s" and "S" as hotkey for skipping silence

Steps for Testing

1. Navigate to a Livestream with silence
2. Press "s" or "S"

[github-actions[bot]]

Your Testserver will be ready at https://1303.test.live.mm.rbg.tum.de in a few minutes.

Logins

| Kurs1 | Kurs2 | Kurs3 | Kurs4 | | ---------------------------------------- | ------------------------- | ------------------------- | ------------------------- | | public | public | loggedin | enrolled | | prof1 | prof1 | prof2 | prof1
prof2 | | student1
student2
student3 | student1
student2 | student2
student3 | student1
student2 |