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 partial contract, matching .powered-by CSS selector, and 0.13.0 min-version requirement were each verified against the shipped goblog v0.13.0 release, and no objective issues were found in this small presentational change.

Review effort: Balanced
Findings: None

What changed in this PR

This PR updates the Forest theme for goblog so its footer "Powered by goblog" credit comes from goblog's shared _powered_by partial (introduced in goblogplatform/GoBlog#644) rather than being hand-written in the theme. This makes the new Show "Powered by goblog" admin setting take effect on this theme and points the credit link at goblog.live instead of the GitHub repo. I verified the _powered_by partial ships in the goblog v0.13.0 release and renders <span class="powered-by">Powered by <a href="https://www.goblog.live" …>goblog …</a></span>, so the new CSS selector and the min-version bump line up correctly.

Changes:

• footer.html renders {{ template "_powered_by" . }} inside the same styled <p>; the partial emits an inline <span>, so the markup stays valid.
• Adds .powered-by a { color: inherit; } so the link inherits the surrounding rgba(255,255,255,0.4) color, matching the previous inline color exactly.
• Bumps min_goblog_version to 0.13.0 (the first release containing the partial) and documents the change in CHANGELOG.md (1.4.0).

File	Description
templates/​footer.html	Replaces the hand-written credit line with the shared _powered_by partial include.
static/​css/​goblog.css	Adds .powered-by a { color: inherit; } to preserve the credit link's footer color.
goblog-theme.json	Raises min_goblog_version to 0.13.0 to require the release that provides the partial.
CHANGELOG.md	Adds a 1.4.0 entry describing the partial switch and new goblog requirement.

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