docs: add robots and favicon exceptions

GoogleCloudPlatform / functions-framework

The Contract for Building New Function Frameworks

Apache License 2.0

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Closed grant closed 4 years ago

grant commented 4 years ago

Add rules about robots and favicons per the internal FF doc. R: @jskeet

noopole commented 3 years ago

Note that it won't work if the robots.txt file is in 3-digit subdirectory too (ex: /503/robots.txt)