Merge internal and external troubleshooting pages into one with optional internal-only content

Summary: Merged internal and external troubleshooting pages into one with optional internal-only content

Reviewed By: mweststrate

Differential Revision: D23651656

fbshipit-source-id: 330dd4b5cb49ae403a0a3760c1e23e30e56ad190

docs/troubleshooting.mdx

@@ -5,6 +5,7 @@ sidebar_label: Troubleshooting Issues
 ---
 import useBaseUrl from '@docusaurus/useBaseUrl';
 import Link from '@docusaurus/Link';
+import FBContent from '../website/src/components/FBContent';
 
 We hope that flipper works well out of the box, but the software is a work in progress and problems will occur. Below are some known issues and steps you can take to try to resolve them.
 
@@ -165,3 +166,9 @@ If you experience errors such as `Undefined symbol: associated type descriptor f
    <img alt="Screenshot showing the places mentioned in the last steps" src={useBaseUrl("img/troubleshooting-react-native-ios-swift-2.png")} />
 
 1. Now you can run your build normally.
+
+## Facebook-specific issues
+
+<FBContent 
+  internal={() => require('./fb/troubleshooting.mdx')} 
+  external={"Luckily you're in Open Source, so you don't have to worry about this stuff."} />