Enable Ctrl-F and right click

[adrienjoly]

The "find" feature is harder to implement than I thought:

• I don't know how to inject https://github.com/rhysd/electron-in-page-search into the renderer, as the pages are loaded from openwhyd.org (instead of locally) and I've disabled require() in order to prevent jQuery to run in node.js mode.
• Next thing to try: https://www.jqueryscript.net/text/Fast-Live-Search-Plugin-With-Text-Highlighting-Gsearch.html (jquery plugin that I could probably inject using executeJavaScript)