docs: remove env configure

[royendo]

Based on Conversation here:
https://rilldata.slack.com/archives/C01ADAYF1PZ/p1758873518079839?thread_ts=1758844685.882189&cid=C01ADAYF1PZ

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!

[begelundmuller]

@royendo Requested your review on the actual code removal here: #8536

[ericpgreen2]

Minor fix:

• Typo in variables-and-credentials.md: "loca CLI" → "local CLI"

Future consideration:
The "Deploy to Rill Cloud" sections are now nearly identical across ~15 connector pages. If this text needs to change again, you might consider creating a reusable MDX component (similar to the existing Video or ConnectorIcon components) that accepts credentialType and connector props. Not necessary for this PR, but could simplify future maintenance.

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Developed in collaboration with Claude Code

[ericpgreen2]

Minor fix:

• Typo in variables-and-credentials.md: "loca CLI" → "local CLI"

Future consideration:
The "Deploy to Rill Cloud" sections are now nearly identical across ~15 connector pages. If this text needs to change again, you might consider creating a reusable MDX component (similar to the existing Video or ConnectorIcon components) that accepts credentialType and connector props. Not necessary for this PR, but could simplify future maintenance.

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Developed in collaboration with Claude Code