Indicate BMT 2026 events aren't live on ContestDojo yet on the registration buttons

[devin-ai-integration]

Summary

The BMT 2026 and BMT 2026 Online events aren't loaded on ContestDojo yet, but the "Registration Portal" buttons looked like normal live links. The status is now on the button itself (the "coming soon" alert lives below it), while the button stays clickable so visitors can create a ContestDojo account in advance.

button_link gains two optional args:

{% button_link(href=..., muted=true, note="BMT 2026 isn't listed yet — you can create an account now") %} Registration Portal {% end %}

• muted swaps bg-teal-500 for bg-slate-500
• note renders a small second line inside the anchor

Existing call sites are unaffected. Applied to content/events/bmt-2026.md and content/events/bmt-2026-online.md.

Revert by dropping muted/note from the two call sites once the events are live on ContestDojo.

Link to Devin session: https://app.devin.ai/sessions/211e3a4949024adeac55e10946c4d989
Requested by: @alphdelta

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[devin-ai-integration]

Verified locally (Tailwind build + zola serve)

Muted button_link variant and the 2026 registration notes render and behave as intended; existing button usages are unaffected.

BMT 2026 / BMT 2026 Online — muted grey button with note

• Button background is slate grey (not teal), note appears as a smaller second line inside the anchor.
• Clicking still navigates to https://contestdojo.com/ (ContestDojo login page loads).

Regression — unchanged button_link usages

/events/bmmt-2026/ and /archives/bmt-2025/ buttons remain teal, single-line, no note; "Contest Results" opens results.pdf.

Narrow viewport (~310px)

Note fits inside the button with no clipping or horizontal overflow.

Written by Devin