Added project: Vade Mecum Shelf (#1579)

* Added project: Vade Mecum Shelf

Vade Mecum Shelf is a collection of utilities wrapped into one single app, built with Electron.
Two utilities are making use of KaTeX:
- LaTeX Math Renderer
- Trigonometric Formulas

* fix lint

website/siteConfig.js

@@ -28,6 +28,12 @@ const users = [
         infoLink: 'https://gitlab.com/',
         pinned: true,
     },
+    {
+        caption: 'Vade Mecum Shelf',
+        image: 'https://raw.githubusercontent.com/tonton-pixel/vade-mecum-shelf/master/icons/icon.png',
+        infoLink: 'https://github.com/tonton-pixel/vade-mecum-shelf/',
+        pinned: true,
+    },
 ];
 
 const siteConfig = {