docs: various updates

- jsapi: include source links
 - README.md: link to github pages
 - docs/README.md: add stub index page

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

jsdoc.conf.json

@@ -12,7 +12,10 @@
     ],
     "templates": {
         "cleverLinks": true,
-        "monospaceLinks": true
+        "monospaceLinks": true,
+        "default": {
+                "outputSourceFiles": true
+        }
     },
     "opts": {
         "destination": "docs/jsapi",