Sunset legacy libraries

[wenxi-zeng]

Proposed changes

the proposed changes are part of the plan of sunsetting legacy libraries (analytics-ios/android, .net and xamarin). the changes are as following:

• remove all the entries and references to the pages of legacy libs
• lower the rank of the pages of the legacy libs so they will be listed at the bottom of search results
• update react-native source page with the most recent changes
• update csharp source page and migration guide with the most recent changes
• update labels of legacy libs to community
• add EoS announcement to all pages of legacy libs

Merge timing

ASAP once approved

Related issues (optional)

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