Remove stale Connectors update guide

[akeller]

Description

Via https://camunda.slack.com/archives/C02JLRNQQ05/p1731098751001189.

When should this change go live?

• This is a bug fix, security concern, or something that needs urgent release support.
• This is already available but undocumented and should be released within a week.
• This on a specific schedule and the assignee will coordinate a release with the DevEx team. (apply hold label or convert to draft PR)
• This is part of a scheduled alpha or minor. (apply alpha or minor label)
• There is no urgency with this change and can be released at any time.

PR Checklist

• My changes are for an already released minor and are in /versioned_docs directory.
• My changes are for the next minor and are in /docs directory (aka /next/).

• My changes require an Engineering review, and I've assigned the Engineering DRI or delegate.
• My changes require a technical writer review, and I've assigned @camunda/tech-writers as a reviewer.

[sbuettner]

🥳

[akeller]

@sbuettner, I removed the admonition in the connectors that pointed to the update guide because it also looked stale. Please take a look at that change specifically, but that should correct any link issues detected by the build workflow.

[akeller]

@pepopowitz, can you look at these build errors? It looks like the partials aren't playing nice, but I didn't touch them in this PR. Any ideas?

[pepopowitz]

Yeah, I'm not sure what this is about either. I pulled the branch locally, and the links it's complaining about work for me.

I kicked off a re-run of build-docs, hoping it was a blip? 🤞

[github-actions]

👋 🤖 🤔 Hello, @akeller! Did you make your changes in all the right places?

These files were changed only in docs/. You might want to duplicate these changes in versioned_docs/version-8.6/.

• docs/components/connectors/custom-built-connectors/connector-sdk.md

You may have done this intentionally, but we wanted to point it out in case you didn't. You can read more about the versioning within our docs in our documentation guidelines.

[akeller]

I don't know what's going on with the build here, and I'm giving up with debugging attempts. Join me over here while I fix the redirects - #4598

[github-actions]

🧹 Preview environment for this PR has been torn down.