Fix svg height, add conversion options and options to use differents data from GitHub account (#35)

* Display all features on web instance but disable them when they're not enabled

* Resize dynamically SVG output and add support to convert images to jpeg/png

* Disable animations when computing height

* Add option to disable animations

* Add options to specify different data from used GitHub account

* Update tests

source/app/web/index.mjs

@@ -2,4 +2,4 @@
   import app from "./instance.mjs"
 
 //Start app
-  await app({mock:process.env.USE_MOCKED_DATA})
+  await app({mock:process.env.USE_MOCKED_DATA, nosettings:process.env.NO_SETTINGS})