This PR introduces a new hidden site setting that allows admins to display a splash screen while site assets load.
The splash screen can be enabled via the `splash_screen` hidden site setting.
This is what the splash screen currently looks like
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| .. | ||
| _discourse_publish_stylesheet.html.erb | ||
| _discourse_splash.html.erb | ||
| _discourse_stylesheet.html.erb | ||
| _google_tag_manager_body.html.erb | ||
| _google_tag_manager_head.html.erb | ||
| _google_universal_analytics.html.erb | ||
| _second_factor_backup_input.html.erb | ||
| _second_factor_text_field.html.erb | ||