chore: update discord link

[thephez]

Replace older Discord link with current one

Summary by CodeRabbit

• Documentation
  • Updated Dash Discord links across developer and governance docs to the current chat.dash.org domain to ensure users are directed to the official community channel. Existing forum link unchanged. Text-only updates; no functional changes.

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Preview build: https://dash-docs--539.org.readthedocs.build/en/539/

[coderabbitai]

Walkthrough

Updated two documentation files to replace outdated Dash Discord links (staydashy.com) with the new domain (chat.dash.org) in community guidance sections.

Changes

Cohort / File(s)	Summary
Documentation Discord link updates docs/user/developers/testnet.rst, docs/user/governance/eight-steps.rst	Replaced Discord server URL from http://staydashy.com/ to http://chat.dash.org/ in community/tools and pre-proposal discussion guidance text. No code or control-flow changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Pre-merge checks

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'chore: update discord link' directly and clearly describes the main change in the changeset, which is updating Discord links across documentation files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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