Factor hardcoded image paths out in RNTester/Image example, get rid of .ico file

[rshest]

Summary:

Changelog:

[Internal] -

RNTester Image example used hardcoded https://www.facebook.com/favicon.ico, which has an uncommon ICO format, for no good reason aside of just this image being served from facebook.com.

This diff:

• Replaces the ICO image with a PNG one (which is still served from facebook.com
• Factors out all the multiple hardcoded paths into constants, so that it's easier to make such changes in the future
• Changes another image to something that is a bit better on the eyes when severely downscaled

Differential Revision: D56978929

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D56978929

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	19,495,289	+275
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	22,867,610	+39
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: a881b51febd1fd809bc9d4fd368a1833f4c850c6 Branch: main

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D56978929

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D56978929

[facebook-github-bot]

This pull request has been merged in facebook/react-native@362abb9ffea5af7e6e5616849fbce28166c758a0.