V0.2.0-BETA: Add branding .env variables and remove hard coded.

• Add branding .env variables and remove hard coded values
• Add README.md
• Add public url to server start log
• Fix: Create admin to promote correct account
• standalone binary
• Add command line interface
• Add permissions to the page
• migrations for user roles
• Add creation of the initial user to the main func
• Adding click statistics
• Make the links and users list scrollable
• Adding user view
• Adding Dangerzone and deletion of links
• Make links editable
• save instead of edit
• add sorting functionality to the tables
• Fix logging
• Add editable user profiles
• make smaller qrcodes
• fix links
• redesign headline
• make table layout in overview
• Add PNG download of QR-Code
• SeeOther instead of TemporaryRedirect
• disable caching