docs(en): Add stub notices to services articles

content/en/docs/Services/bitwarden.md

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   Bitwarden is a self-hosted password manager.
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content/en/docs/Services/delta-chat.md

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   Delta Chat is an encrypted messaging app that uses email as transport.
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 Messengers like Telegram, Signal, Whatsapp can't be private due to the peculiarities of architecture - centralization. And peer-to-peer (p2p) services like tox consume too many resources and are inconvenient to use on a mobile device. The best solution is to use **our own** server.
 - **Delta.Chat** - uses your personal email server

content/en/docs/Services/email.md

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   Self-hosted e-mail service.
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 ## Authentication
 
 Users from the "users" tab of your app are used.

content/en/docs/Services/gitea.md

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   Gitea is a self-hosted Git service.
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content/en/docs/Services/nextcloud.md

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   Nextcloud is a self-hosted file sharing and collaboration platform.
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 # Authentication
 
 When creating a server, `admin` Nextcloud user is created with the password you've used for

content/en/docs/Services/pleroma.md

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   Pleroma is a self-hosted microblogging platform.
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 _Substitute to: Twitter_