chore: add external articles and update events

[kavishkafernando]

Purpose

• Add external articles
• Update upcoming and past events

Related Issues

Include any related issues that are resolved by this PR.

Checklist

• Updated sidebars.ts if adding a new documentation page
• Run npm run start to preview the changes locally
• Run npm run build to ensure the build passes without errors
• Verified all links are working (no broken links)

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds three new community article entries (with preview images) to externalArticles.ts and fixes one source capitalization. Updates events.json to replace the upcoming event and rotate the June 25 community call into past events. Updates past-events.json with two new past event entries and renames two action labels.

Changes

Content Data Updates

Layer / File(s)	Summary
External articles: new entries and source fix src/data/externalArticles.ts	Imports three new preview images and inserts two new article objects (Zero Trust/Istio Ambient Mesh, Kubernetes to Platform/Custom Resources) mid-array, appends one new article (Backstage development platform), and fixes 'medium' → 'Medium' on an existing entry.
Community events: upcoming and past event updates src/pages/community/events.json, src/pages/community/past-events.json	Replaces the first upcoming event with "KSUG.AI Australia - Melbourne Meetup" (July 1); moves June 25 community call to pastEvents; removes the June 4 Kubernetes Sri Lanka past entry. Prepends June 25 and June 18–19 (KubeCon India) entries to past-events.json; updates action text from "Watch the Session" to "Watch Video" for Cloud Native Mexico City and SREday Seattle entries.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• openchoreo/openchoreo.github.io#709: Modifies the same community event JSON files, updating/adding/removing specific event entries and fields.
• openchoreo/openchoreo.github.io#731: Directly overlaps with KubeCon + CloudNativeCon India 2026 relocation logic between events and pastEvents.
• openchoreo/openchoreo.github.io#729: Modifies src/data/externalArticles.ts by adding entries and preview image imports in the same pattern.

Suggested reviewers

• LakshanSS
• rashadism

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description covers purpose and checklist, but the Related Issues section is still a template placeholder.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly matches the main changes: adding external articles and updating event listings.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[LakshanSS]

LGTM