update some links and references to gbdev org accounts

Author: avivace

src/part2/wip.md

@@ -6,7 +6,7 @@ As explained in the initial tutorial presentation, Part Ⅱ consists of us build
 However, this is not finished yet; lessons are uploaded as they are made, so the tutorial just abruptly stops at some point.
 Sorry!
 
-Please hold tight while I (and others!) are working on this, maybe [follow me on Twitter](https://twitter.com/issotm) for (infrequent) updates, and go to the next page to find out what you can do in the meantime!
+Please hold tight while we are working on this, [follow us on Twitter](https://twitter.com/gbdev0) for updates, and go to the next page to find out what you can do in the meantime!
 
 Thank you for your patience 😊 and see you around on GBDev!
 

theme/head.hbs

@@ -1,5 +1,5 @@
 <meta name="twitter:card" content="summary_large_image"/>
-<meta name="twitter:site:id" content="@issotm"/>
+<meta name="twitter:site:id" content="@gbdev0"/>
 <meta property="og:title" content="{{ title }}" />
-<meta property="og:image" content="https://eldred.fr/gb-asm-tutorial/assets/banner/1200x628.png" />
+<meta property="og:image" content="https://gbdev.io/gb-asm-tutorial/assets/banner/1200x628.png" />
 <meta property="og:site_name" content="{{ book_title }}"/>