[PR] Remove vscode-flow from docs
[PR] Remove vscode-flow from docs

Summary:
I recently (a few months ago) deprecated `vscode-flow` in favor of people using the official project vscode extension.

closes: #3584
Closes https://github.com/facebook/flow/pull/3626

Differential Revision: D4820151

Pulled By: samwgoldman

fbshipit-source-id: 2c714e2ed9f67114939dc178f37b26e63511a987

facebook/flow,popham/flow,AgentME/flow,mroch/flow,jamesgpearce/flow,AgentME/flow,popham/flow,gabelevi/flow,JonathanUsername/flow,claudiopro/flow,gabelevi/flow,MichaelDeBoey/flow,MichaelDeBoey/flow,JonathanUsername/flow,JonathanUsername/flow,gabelevi/flow,ylu1317/flow,samwgoldman/flow,gabelevi/flow,jamesgpearce/flow,nmote/flow,samwgoldman/flow,jamesgpearce/flow,facebook/flow,AgentME/flow,nmote/flow,fletcherw/flow,fletcherw/flow,TiddoLangerak/flow,mroch/flow,nmote/flow,claudiopro/flow,TiddoLangerak/flow,facebook/flow,fletcherw/flow,fletcherw/flow,TiddoLangerak/flow,samwgoldman/flow,facebook/flow,mroch/flow,nmote/flow,samwgoldman/flow,MichaelDeBoey/flow,MichaelDeBoey/flow,facebook/flow,fletcherw/flow,MichaelDeBoey/flow,ylu1317/flow,ylu1317/flow,mroch/flow,TiddoLangerak/flow,mroch/flow,mroch/flow,JonathanUsername/flow,samwgoldman/flow,nmote/flow,ylu1317/flow,gabelevi/flow,JonathanUsername/flow,AgentME/flow,gabelevi/flow,samwgoldman/flow,jamesgpearce/flow,claudiopro/flow,gabelevi/flow,popham/flow,ylu1317/flow,nmote/flow,TiddoLangerak/flow,claudiopro/flow,popham/flow,nmote/flow,JonathanUsername/flow,jamesgpearce/flow,facebook/flow,popham/flow,samwgoldman/flow,facebook/flow,popham/flow,AgentME/flow,popham/flow,jamesgpearce/flow,mroch/flow,jamesgpearce/flow,JonathanUsername/flow,fletcherw/flow,claudiopro/flow