Drop outdated links to wiki (#57898)

Summary:
Pull Request resolved: #57898

Changelog: [Internal]

___

Differential Revision: D115564599

fbshipit-source-id: 4714995277556fc60550780e7a911e60eeef2f0d

Author: huntie

.github/workflow-scripts/analyze_scripts.sh

@@ -21,6 +21,6 @@ if [ -x "$(command -v shellcheck)" ]; then
     -exec sh -c 'shellcheck "$1"' -- {} \;
 
 else
-  echo 'shellcheck is not installed. See https://github.com/facebook/react-native/wiki/Development-Dependencies#shellcheck for instructions.'
+  echo 'shellcheck is not installed. Install it via your package manager, e.g. `brew install shellcheck`.'
   exit 1
 fi

README.md

@@ -119,12 +119,6 @@ Read our [**Contributing Guide**][contribute] to learn about our development pro
 
 [contribute]: https://reactnative.dev/docs/contributing
 
-### [Open Source Roadmap][roadmap]
-
-You can learn more about our vision for React Native in the [**Roadmap**][roadmap].
-
-[roadmap]: https://github.com/facebook/react-native/wiki/Roadmap
-
 ### Good First Issues
 
 We have a list of [good first issues][gfi] that contain bugs which have a relatively limited scope. This is a great place to get started, gain experience, and get familiar with our contribution process.