Remove hosting documentation for unrelated platforms

[uknownnmonitor]

Amplify hosting services documentation for unrelated platforms is misleading! like flutter, android, swift, angular js

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
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[ironspur5]

Agreed, incorrect documentation here. I have only seen one reference of Amplify Hosting working with Flutter for example: https://medium.com/flutter-community/hosting-flutter-web-applications-with-amplify-hosting-and-github-actions-d53ba213767.

[uknownnmonitor]

you are right! @ironspur5, super code clean examples in the documentation are super helpful ❤️ ! maybe we should paste this example in all the pages, thanks for pointing me in the right direction.