Various fixes and improvements

What's Changed

• remove bot permissions and fix leaking discord id by @GlysVenture in #53
• add q&a questions for membership and discord by @GlysVenture in #56
• Adds png file for the logo by @LucasGuesry in #54
• fix error 500 on not existing session by @GlysVenture in #60
• add auto membership upon same mail in membercode and verified mail by @GlysVenture in #62
• Add discord and telegram links as settings by @GlysVenture in #63
• Add button more events on welcome page by @GlysVenture in #64
• Add auto removal of event participants after 1 month by @GlysVenture in #65

Full Changelog: v1.1.1...v1.1.2