fix: correct favicon and preview description

[rxinui]

Changes

Uses the correct favicon and correct the link preview description.

Fixes #165

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[rxinui]

@adambkaplan

[adambkaplan]

This adds a lot of code that is maintained elsewhere (base hugo and the lotusdoc theme). I think this approach is simpler: #167

[SaschaSchwarze0]

As discussed in the community meeting.