Add favicon and manifest properties to shell.handlebars

[djyotta]

Resolves #317

[djyotta]

@lovasoa Is the component documentation in a different codebase? I couldn't find it otherwise I would have updated it.

[lovasoa]

The documentation is here: https://github.com/lovasoa/SQLpage/blob/b2f646aac0924c066fc0e942d6536e460d64c9bb/examples/official-site/sqlpage/migrations/01_documentation.sql#L761

You can edit the existing migration, since the official website's database is a volatile in-memory sqlite.

[djyotta]

Cool! I spun up the documentation - not sure how I missed that. I should have grep'd for it.

Docs look ok to me. I tried to be restrict verbosity to be similar to the neighbouring cards.