Update index.html.erb (#CleanUpGitHub)

Hi there! In many countries, 'twat' is a slang term for genitalia, and using it can make people feel uncomfortable or unwelcome. As an added bonus, your website pages now use more consistent nomenclature. Thanks!

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This comment has been identified as either hateful, hurtful or discriminatory as part of a project to #CleanUpGitHub. This pull request was made by a human. For more info, please check EthicalCode’s website at www.ethicalco.de/cleanupgh