Links to online documentation:

* Adding a help button on top of the chat, that links to the online documentation on frama.io.
* Replaced github.io documentation links by frama.io documentation.
* Adding links to the documentation in the diagnostic tool.

shared/lib/help.ts

@@ -0,0 +1,17 @@
+function helpUrl (options: {
+  lang?: string
+  page?: string
+}): string {
+  let url = 'https://livingston.frama.io/peertube-plugin-livechat/'
+  if (options.lang && /^[a-zA-Z_-]+$/.test(options.lang)) {
+    url = url + options.lang + '/'
+  }
+  if (options.page && /^[\w/-]+$/.test(options.page)) {
+    url = url + options.page + '/'
+  }
+  return url
+}
+
+export {
+  helpUrl
+}