Link incubations

[christianliebel]

This PR links the incubations repository instead of enumerating the incubated extensions. It's hard to keep that in sync, and the manifest incubations repository has way more incubations than just BIP. The share target incubation is also linked in manifest incubations.

This change (choose at least one, delete ones that don't apply):

• Makes editorial changes (changes informative sections, or changes normative sections without changing behavior)

Commit message:

Editorial: Link incubations

Person merging, please make sure that commits are squashed with one of the following as a commit message prefix:

• chore:
• editorial:
• BREAKING CHANGE:
• And use none if it's a normative change

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