docs: add navigation links

Author: lowlighter

source/app/metrics/metadata.mjs

@@ -335,7 +335,7 @@ metadata.plugin = async function({__plugins, __templates, name, logger}) {
       //Header table
       const header = [
         "<table>",
-        `  <tr><td colspan="2"><a href="/README.md#-plugins">← Back to plugins index</a></td></tr>`,
+        '  <tr><td colspan="2"><a href="/README.md#-plugins">← Back to plugins index</a></td></tr>',
         `  <tr><th colspan="2"><h3>${meta.name}</h3></th></tr>`,
         `  <tr><td colspan="2" align="center">${marked.parse(meta.description ?? "", {silent: true})}</td></tr>`,
         meta.authors?.length ? `<tr><th>Authors</th><td>${[meta.authors].flat().map(author => `<a href="https://github.com/${author}">@${author}</a>`)}</td></tr>` : "",
@@ -463,7 +463,7 @@ metadata.template = async function({__templates, name, plugins}) {
     //Header table
     const header = [
       "<table>",
-      `  <tr><td colspan="2"><a href="/README.md#%EF%B8%8F-templates">← Back to templates index</a></td></tr>`,
+      '  <tr><td colspan="2"><a href="/README.md#%EF%B8%8F-templates">← Back to templates index</a></td></tr>',
       `  <tr><th colspan="2"><h3>${meta.name ?? "(unnamed template)"}</h3></th></tr>`,
       `  <tr><td colspan="2" align="center">${marked.parse(meta.description ?? "", {silent: true})}</td></tr>`,
       "  <tr>",