chore: remove Vercel docs deploy CI jobs

[Copilot]

Summary

The Vercel project that hosted the docs site no longer exists. Removes the two CI jobs that depended on it:

• docs — built and deployed docs/slides/visualizer to Vercel on every run (VERCEL_TOKEN, VERCEL_ORG_ID, VERCEL_PROJECT_ID)
• e2e_cdn — ran CDN integration tests against the Vercel deployment URL (stripe-sync.dev/stripe-api-specs)

No other jobs had a needs dependency on either.

How to test (optional)

Related

Thanks for contributing ❤️

Original prompt

Create a pull request in stripe/sync-engine-fork that removes the CI/docs deploy configuration related to the old Vercel project, since that Vercel project no longer exists.

Context:

• The user said: "that vercel project is no more i think. can u just create a new pr that removes this ci deploy docs thing?"
• The repository was confirmed as stripe/sync-engine-fork.
• Relevant reference PR: Add source and destination for custom object support #356
• Use main as the base branch.

Task:

• Identify the workflow/config/docs deployment pieces in this repository that publish or deploy docs via CI and rely on the old Vercel project.
• Remove or disable that CI/docs deploy setup cleanly.
• Update any related docs/comments/configuration as needed so the repo no longer references or expects that deploy path.
• Keep the change narrowly scoped to removing the obsolete docs deploy/Vercel integration.

Deliverable:

• Open a new pull request with the changes.

The following is the prior conversation context from the user's chat exploration (may be truncated):

User: that vercel project is no more i think. can u just create a new pr that removes this ci deploy docs thing?

Assistant: Yes — I can do that, but I need the target repository explicitly confirmed.

You linked this PR:

• stripe/sync-engine-fork PR #356

If you want, I can create a new PR in:

• stripe/sync-engine-fork

that removes the CI/docs deploy thing that references the old Vercel project.

Reply with something like:

• Yes, create it in stripe/sync-engine-fork
• optionally: base branch is main or another branch if not the default

Once you confirm the repo, I’ll open the PR.

User: yes create it in the repo

Assistant: I’ve started the PR creation process and we’re waiting for your response to the confirmation dialog to continue.

This pull request was created from Copilot chat.

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[Copilot]

Pull request overview

Removes the obsolete GitHub Actions CI jobs that deployed the docs site to Vercel and then ran CDN E2E tests against that deployment, since the Vercel project no longer exists.

Changes:

• Deleted the docs workflow job that built and deployed docs/ (including slides + visualizer) to Vercel.
• Deleted the e2e_cdn workflow job that depended on the Vercel deployment URL to run CDN integration tests.

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[tonyxiao]

should bring this back some point. but sog for now