Convert Cloud Storage from legacy (#333)

Signed-off-by: Daniel Nathan Gray <dng@disroot.org>

_data/providers/cloud/1_nextcloud.yml

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+title: Nextcloud
+type: Recommendation
+logo: /assets/img/cloud/nextcloud.svg
+description: |
+  <strong>Nextcloud</strong> is a suite of free and open-source client-server software for creating your own file hosting services on a private server you control. It also comes with experimental end-to-end encryption (E2EE).
+
+  We recommend checking if your Nextcloud provider supports E2EE, otherwise you have to trust the provider to not look at your files.
+
+  When self hosting Nextcloud, you should also remember to enable E2EE to protect against your hosting provider from snooping on your data.
+
+website: 'https://nextcloud.com/'
+privacy_policy: 'https://nextcloud.com/privacy/'
+downloads:
+  - icon: fab fa-windows
+    url: 'https://nextcloud.com/install/#install-clients'
+  - icon: fab fa-apple
+    url: 'https://nextcloud.com/install/#install-clients'
+  - icon: fab fa-linux
+    url: 'https://nextcloud.com/install/#install-clients'
+  - icon: fab fa-freebsd
+    url: 'https://www.freshports.org/www/nextcloud/'
+  - icon: ptio-openbsd
+    url: 'http://openports.se/www/nextcloud'
+  - icon: ptio-netbsd
+    url: 'http://pkgsrc.se/www/php-nextcloud'
+  - icon: fab fa-android
+    url: 'https://f-droid.org/packages/com.nextcloud.client/'
+  - icon: fab fa-google-play
+    url: 'https://play.google.com/store/apps/details?id=com.nextcloud.client'
+  - icon: fab fa-app-store-ios
+    url: 'https://itunes.apple.com/us/app/nextcloud/id1125420102'
+  - icon: fab fa-github
+    url: 'https://github.com/nextcloud'