Update README.md

Remove old image with incorrect scheme name.

Author: ps2

README.md

@@ -43,6 +43,3 @@ Select the LoopConfigOverride file in Xcode's project navigator, uncomment the `
 ### Build
 
 Select the "LoopWorkspace" scheme (not the "Loop" scheme) and Build, Run, or Test.
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-<a href="/docs/scheme-selection.png"><img src="/docs/scheme-selection.png?raw=true" alt="Image showing how to select the Loop (Workspace) scheme in Xcode" width="400"></a>
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