Doc link correction

[Vijay-Nirmal]

Issue: #1558

PR Type

What kind of change does this PR introduce?

• Documentation content changes

What is the current behavior?

1. Scale animation has sample output of fade animation
   ![Scale Behavior animation](../resources/images/Animations/Fade/Sample-Output.gif)
2. Useless resources in [UWPCommunityToolkit/docs/resources/images/](https://github.com/Microsoft/UWPCommunityToolkit/tree/master/docs/resources/images

PR Checklist

• Docs have been added / updated (for bug fixes / features)

What is the new behavior?

Changed fade animation sample output link to scale animation
![Scale Behavior animation](../resources/images/Animations/Fade/Sample-Output.gif)
2. Removed useless resources

Does this PR introduce a breaking change?

No

[dnfclas]

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