Provide HTTP API reference

  This has always been somewhat poorly documented in a nested page of
  the user manual. Now it's more visible and thorough.

  Closes #396.

CHANGELOG.md

@@ -1,9 +1,9 @@
 ---
 title: "Changelog"
-weight: 5
+weight: 6
 chapter: false
 layout: changelog
-pre: "<b>5. </b>"
+pre: "<b>6. </b>"
 math: true
 ---
 

docs/content/api/_index.md

@@ -1,5 +1,5 @@
 +++
-title = "API Reference (v6.5.*)"
+title = "WebSocket API Reference (v6.5.*)"
 weight = 4
 chapter = false
 pre = "<b>4. </b>"

docs/content/http-api/_index.md

@@ -0,0 +1,6 @@
++++
+title = "HTTP API Reference (v6.5.*)"
+weight = 5
+chapter = false
+pre = "<b>5. </b>"
++++

docs/layouts/http-api/list.html

@@ -0,0 +1,45 @@
+{{ partial "header.html" . }}
+{{ partial "openapi-header.html" . }}
+<style>
+  #body #body-inner {
+    padding: 0;
+  }
+
+  #navigation,
+  div#body-inner > h1,
+  div#head-tags,
+  #operations > ul > li div.panel-item--center > div:nth-child(3) {
+    display: none;
+  }
+
+  table,
+  table tr td {
+    border: unset !important;
+  }
+
+  ul[role='menu'] ~ div {
+    display: none;
+  }
+</style>
+<redoc id="redoc-container"></redoc>
+<script>
+  Redoc.init(`/openapi.yaml`, {
+    disableSearch: true,
+    hideDownloadButton: true,
+    hideRequestPayloadSample: true,
+    simpleOneOfTypeLabel: true,
+    expandResponses: '200,201',
+    theme: {
+      logo: {
+        gutter: '2rem',
+      },
+      sidebar: {
+        width: '0px',
+      },
+      rightPanel: {
+        width: '45%',
+      }
+    }
+  }, document.getElementById('redoc-container'));
+</script>
+{{ partial "footer.html" . }}

docs/layouts/partials/openapi-header.html

@@ -0,0 +1 @@
+<script src="https://cdn.jsdelivr.net/npm/redoc@2.1.5/bundles/redoc.standalone.js"></script>