Remove changelog in main folder, update comments

OpenKeychain/src/main/res/raw/help_about.md

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 [http://www.openkeychain.org](http://www.openkeychain.org)
 

OpenKeychain/src/main/res/raw/help_certification.md

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 ## Key Confirmation
 Without confirmation, you cannot be sure if a key really corresponds to a specific person.

OpenKeychain/src/main/res/raw/help_changelog.md

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 ## 3.2beta2
 

OpenKeychain/src/main/res/raw/help_start.md

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 ## How do I activate OpenKeychain in K-9 Mail?
 To use OpenKeychain with K-9 Mail, you want to follow these steps: