Replace docma with jsdoc

* docma is no longer supported since ~2019 and has
  outstanding security issues with its dependencies.
* We'll use JSDoc as an (almost) drop-in replacement
  for now.

Author: fheft

.jsdoc

@@ -0,0 +1,10 @@
+{
+  "source": {
+    "include": "./src"
+  },
+  "opts": {
+    "encoding": "utf8",
+    "destination": "./docs/reference/",
+    "readme": "README.md"
+  }
+}