fix: 404 docs links in app inspect (#4042)

Summary:
Currently, the `app inspect` tooltip at the left rail has a link to the getting started page that doesn't exist.
New path is `/docs/getting-started/`.

Also fix troubleshooting guide and no devices are found to `/docs/getting-started/troubleshooting/`

Pull Request resolved: https://github.com/facebook/flipper/pull/4042

Reviewed By: lawrencelomax

Differential Revision: D39314971

Pulled By: lblasa

fbshipit-source-id: 000b354b60bd05211b99134b63d790bf6949060f

desktop/flipper-ui-core/src/sandy-chrome/appinspect/AppInspect.tsx

@@ -36,9 +36,7 @@ const appTooltip = (
     Inspect apps by selecting connected devices and emulators. Navigate and
     bookmark frequent destinations in the app. Refresh, screenshot and
     screenrecord is also available.{' '}
-    <Link href="https://fbflipper.com/docs/getting-started/index">
+    <Link href="https://fbflipper.com/docs/getting-started/">Learn More</Link>
-      Learn More
-    </Link>
   </>
 );
 

desktop/flipper-ui-core/src/sandy-chrome/appinspect/NoDevices.tsx

@@ -36,7 +36,7 @@ export function NoDevices() {
           <Text>
             Start a fresh emulator <RocketOutlined onClick={onLaunchEmulator} />{' '}
             or check the{' '}
-            <Link href="https://fbflipper.com/docs/getting-started/troubleshooting/troubleshooting">
+            <Link href="https://fbflipper.com/docs/getting-started/troubleshooting/">
               troubleshooting guide
             </Link>
             .