feat: allow to read event_ids from hash url to render a custom schedule - #209

Changed pages include:

• index.html - view
• 404.html - view
• 404/index.html - view
• a/index.html - view
• error/index.html - view
• register/index.html - view
• test/index.html - view
• a/[...].html - view
• a/overflow-player/index.html - view
• a/sponsors/index.html - view

There are more changes not included in the list