Use goblog's shared _powered_by partial for the footer credit

[compscidr]

Why

goblogplatform/GoBlog#644 moves the "Powered by goblog" credit into a shared partial, _powered_by, and adds a Show "Powered by goblog" setting that hides it. This theme wrote the line out itself, linking to the GitHub repository, so the setting had no effect here.

What

• footer.html includes {{ template "_powered_by" . }} inside the same styled <p> as before. The link now goes to https://www.goblog.live.
• goblog.css gains .powered-by a { color: inherit; }, replacing the inline colour the link used to carry, so it looks the same.
• min_goblog_version goes to 0.13.0 and the changelog gets an entry.

Requires goblog 0.13.0

goblogplatform/GoBlog#644 is merged and shipped in goblog v0.13.0, which contains the _powered_by partial. The manifest and changelog here already say 0.13.0. The changelog entry is included here rather than in a separate release PR.

Testing

Validated with theme.ValidateFiles against the goblog#644 branch, and rendered footer.html with the setting on (credit shown) and off (credit absent). Not checked in a browser.

🤖 Generated with Claude Code

[Copilot]

Copilot review overview

🟢 Approval recommended

The small, well-scoped change correctly consumes goblog's shared _powered_by partial, the CSS selector matches the partial's verified markup, and the bumped min_goblog_version points to a real released version containing it.

Review effort: Balanced
Findings: None

What changed in this PR

This PR migrates the Minimal goblog theme's footer credit to use goblog's shared _powered_by partial (introduced in goblogplatform/GoBlog#644) instead of writing out its own "Powered by goblog" line. Previously the theme hardcoded the credit with a link to the GitHub repo, which meant goblog's new Show "Powered by goblog" setting had no effect on this theme. By delegating to the partial, the setting now works here and the link points to goblog.live, consistent with the default theme.

Changes:

• Replace the hardcoded footer credit with {{ template "_powered_by" . }}, keeping the same styled <p> wrapper.
• Add .powered-by a { color: inherit; } so the partial's link matches the surrounding footer color (replacing the previous inline color).
• Bump min_goblog_version to 0.13.0 (the first release containing the partial) and add a 1.2.0 changelog entry.

File	Description
templates/​footer.html	Swaps the hand-written credit line for the shared _powered_by partial.
static/​css/​goblog.css	Adds .powered-by a { color: inherit; } so the partial's link keeps the footer color.
goblog-theme.json	Raises min_goblog_version to 0.13.0, which contains the partial.
CHANGELOG.md	Documents the change and the new goblog 0.13.0 requirement under 1.2.0.

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