feat: Icon component (#1499)

* New icons and old strucure of OHIF ui v1

* Export icon

* Removing wrong import and fixing some exports

* Fixing svg loader and svg images to fullCurrent

* Small fixes on docz

* Remove repeated icon

* Update other components to use Icon

* Update platform/ui/src/components/Icon/icon.mdx

Co-Authored-By: Rodrigo Antinarelli <rodrigoantinarelli@gmail.com>

* Fixing callouts

* Move icons to assets and fixing layout on iconButtons

* Fix path of icons

Co-authored-by: Danny Brown <danny.ri.brown@gmail.com>
Co-authored-by: Rodrigo Antinarelli <rodrigoantinarelli@gmail.com>

platform/ui/gatsby-config.js

@@ -1,3 +1,7 @@
 module.exports = {
-  plugins: ['gatsby-plugin-sass', `gatsby-plugin-postcss`],
+  plugins: [
+    'gatsby-plugin-react-svg',
+    'gatsby-plugin-sass',
+    `gatsby-plugin-postcss`,
+  ],
 };