Update Icons and use Icon.png name instead

- Add `Icon.png` apart from `nuget.png`
  - This is used as a public reference point for NuGet icon URL. So, keep the original file.
  - If there's a need to update the icon, only update the new one `Icon.png` and keep the old one intact.

Author: Nirmal4G

Microsoft.Toolkit.Uwp.Notifications/Microsoft.Toolkit.Uwp.Notifications.nuspec

@@ -7,7 +7,6 @@
     <requireLicenseAcceptance>true</requireLicenseAcceptance>
     <license type="expression">MIT</license>
     <projectUrl>https://github.com/CommunityToolkit/WindowsCommunityToolkit</projectUrl>
-    <iconUrl>https://raw.githubusercontent.com/CommunityToolkit/WindowsCommunityToolkit/main/build/nuget.png</iconUrl>
     <icon>Icon.png</icon>
     <description>The official way to send toast notifications on Windows 10 via code rather than XML, with the help of IntelliSense. Supports all C# app types, including WPF, UWP, WinForms, and Console, even without packaging your app as MSIX. Also supports C++ UWP apps.
 
@@ -52,8 +51,8 @@
     </dependencies>
   </metadata>
   <files>
-    <file src="..\build\nuget.png" target="Icon.png" />
-    <file src="..\license.md" target="" />
+    <file src="..\build\Icon.png" target="" />
+    <file src="..\License.md" target="" />
     <file src="Microsoft.Toolkit.Uwp.Notifications.targets" target="build\native\Microsoft.Toolkit.Uwp.Notifications.targets" />
     <file src="$buildOutput$\net461\Microsoft.Toolkit.Uwp.Notifications.dll" target="lib\net461\Microsoft.Toolkit.Uwp.Notifications.dll" />
     <file src="$buildOutput$\net461\Microsoft.Toolkit.Uwp.Notifications.pdb" target="lib\net461\Microsoft.Toolkit.Uwp.Notifications.pdb" />

Microsoft.Toolkit.Uwp.SampleApp/SamplePages/MarkdownTextBlock/InitialContent.md

@@ -412,11 +412,11 @@ which renders in:
 
 MarkdownTextblock supports links wrapped with Images.
 
->\[!\[image](https\://raw.githubusercontent.com/CommunityToolkit/WindowsCommunityToolkit/main/build/nuget.png)](https\://docs.microsoft.com/windows/uwpcommunitytoolkit/)
+>\[!\[image](https\://raw.githubusercontent.com/CommunityToolkit/WindowsCommunityToolkit/main/build/Icon.png)](https\://docs.microsoft.com/windows/uwpcommunitytoolkit/)
 
 will render into
 
-[![image](https://raw.githubusercontent.com/CommunityToolkit/WindowsCommunityToolkit/main/build/nuget.png)](https://docs.microsoft.com/windows/uwpcommunitytoolkit/)
+[![image](https://raw.githubusercontent.com/CommunityToolkit/WindowsCommunityToolkit/main/build/Icon.png)](https://docs.microsoft.com/windows/uwpcommunitytoolkit/)
 
 and when clicked will go to the Linked Page.
 
@@ -425,7 +425,7 @@ MarkdownTextBlock also supports Reference based links.
 ```
 [![image][1]][2]
 
-[1]:https://raw.githubusercontent.com/CommunityToolkit/WindowsCommunityToolkit/main/build/nuget.png
+[1]:https://raw.githubusercontent.com/CommunityToolkit/WindowsCommunityToolkit/main/build/Icon.png
 [2]:https://docs.microsoft.com/windows/uwpcommunitytoolkit/
 
 ```
@@ -434,7 +434,7 @@ will render into
 
 [![image][1]][2]
 
-[1]:https://raw.githubusercontent.com/CommunityToolkit/WindowsCommunityToolkit/main/build/nuget.png
+[1]:https://raw.githubusercontent.com/CommunityToolkit/WindowsCommunityToolkit/main/build/Icon.png
 [2]:https://docs.microsoft.com/windows/uwpcommunitytoolkit/
 
 *****

build/Icon.png

@@ -11,7 +11,6 @@
     <PackageProjectUrl>https://github.com/CommunityToolkit/WindowsCommunityToolkit</PackageProjectUrl>
     <PackageReleaseNotes>https://github.com/CommunityToolkit/WindowsCommunityToolkit/releases</PackageReleaseNotes>
     <PackageIcon>Icon.png</PackageIcon>
-    <PackageIconUrl>https://raw.githubusercontent.com/CommunityToolkit/WindowsCommunityToolkit/main/build/nuget.png</PackageIconUrl>
   </PropertyGroup>
 
   <PropertyGroup>

build/Windows.Toolkit.Common.props

@@ -13,7 +13,7 @@
   </PropertyGroup>
 
   <ItemGroup Condition="$(IsPackable)">
-    <None Include="$(BuildToolsDirectory)nuget.png" Pack="true" PackagePath="\Icon.png" />
+    <None Include="$(BuildToolsDirectory)Icon.png" Pack="true" PackagePath="\" />
     <None Include="$(RepositoryDirectory)License.md" Pack="true" PackagePath="\" />
     <None Include="$(RepositoryDirectory)ThirdPartyNotices.txt" Pack="true" PackagePath="\" />
   </ItemGroup>