Upgrade static docs plugin

Summary:
Upgrade the static docs plugin.

You no longer need to import OssOnly and FbInternalOnly in markdown files, so removed those imports too.

Reviewed By: passy

Differential Revision: D26580059

fbshipit-source-id: 2763de2f5fbef41ec2ac7f7bdd147418badb78b6

docs/tutorial/android.mdx

@@ -3,7 +3,6 @@ id: android
 title: Building an Android Plugin
 ---
 import useBaseUrl from '@docusaurus/useBaseUrl';
-import {FbInternalOnly} from 'internaldocs-fb-helpers';
 
 <img alt="Android Tutorial App" src={useBaseUrl("img/android-tutorial-app.png")} />
 

docs/tutorial/intro.mdx

@@ -3,7 +3,6 @@ id: intro
 title: Intro
 ---
 import useBaseUrl from '@docusaurus/useBaseUrl';
-import {FbInternalOnly} from 'internaldocs-fb-helpers';
 
 <img alt="Android App Tutorial" src={useBaseUrl("img/android-tutorial.png")} />
 

docs/tutorial/ios.mdx

@@ -3,7 +3,6 @@ id: ios
 title: Building an iOS Plugin
 ---
 import useBaseUrl from '@docusaurus/useBaseUrl';
-import {FbInternalOnly} from 'internaldocs-fb-helpers';
 
 <img alt="iOS Tutorial App" src={useBaseUrl("img/ios-tutorial-app.png")} />
 

docs/tutorial/js-publishing.mdx

@@ -5,7 +5,6 @@ sidebar_label: Publishing
 ---
 import useBaseUrl from '@docusaurus/useBaseUrl';
 import Link from '@docusaurus/Link';
-import {FbInternalOnly, OssOnly} from 'internaldocs-fb-helpers';
 
 <FbInternalOnly>
 

docs/tutorial/js-setup.mdx

@@ -4,7 +4,6 @@ title: Building a Desktop Plugin
 sidebar_label: Building a Desktop Plugin
 ---
 import useBaseUrl from '@docusaurus/useBaseUrl';
-import {FbInternalOnly, OssOnly} from 'internaldocs-fb-helpers';
 
 Now that we have the native side covered, let's display the data we're sending
 on the desktop side. You can check out the full workflow of building Flipper desktop