adds `.` (jamfile command) to dojo docs

[drbeefsupreme]

Hope that . doesn't trip up Markdown. I don't know what else to call it, but I couldn't find it documented anywhere.

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Name	Status	Preview	Comments	Updated (UTC)
operators-urbit-org	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 26, 2023 4:44pm

[drbeefsupreme]

Yeah the sidebar button doesn't work with this. Maybe we can call it . (jamfile)?

[sigilante]

LGTM,TY