Suggest checking that the GitHub App is installed in the repository when committing returns a Resource not accessible by integration error

[emmatown]

Fixes #503
Fixes #939

This error means that the GitHub App doesn't have write permissions to the configured repo. For public repos, people won't hit the "Repo not found" prompt to install the GitHub App since the repo can still be accessed without the GitHub App being installed in it. Note when using the flow to create a GitHub App, it will redirect them to install the GitHub App in the repo, this is for cases when someone is using a GitHub App created earlier or etc.

[changeset-bot]

🦋 Changeset detected

Latest commit: c1cebe6

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 13 packages

Name	Type
@keystatic/core	Patch
@keystar/docs	Patch
@example/astro-content	Patch
@example/astro	Patch
@example/localization	Patch
@example/next-app	Patch
@example/next-block-builder	Patch
@example/next-pages	Patch
@keystatic/remix-test-app	Patch
keystatic-docs	Patch
@keystatic/templates-astro	Patch
@keystatic/templates-nextjs	Patch
@keystatic/templates-remix	Patch

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