Add storage infra and Nextcloud

docs/handbook/infrastructure/storage/.nav.yml

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+title: Storage
+nav:
+  - index.md
+  - nextcloud.md

docs/handbook/infrastructure/storage/index.md

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+# Storage
+
+!!! abstract "Placeholder Page"
+    This is a placeholder page. Please see the site navigation for any sub-pages that exist.
+
+---
+
+!!! example "Work in Progress"
+    This page is not complete, and is subject to change.
+
+    Want to help with this page? Please see [:octicons-arrow-right-16: Editing this site](https://about.starcat.systems/editing/) and the [:simple-forgejo: Git repo](https://git.starcat.systems/starcatsys/about) for this site.

docs/handbook/infrastructure/storage/nextcloud.md

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+# Nextcloud
+
+We use a Nextcloud instance as our internal "cloud" for file hosting and sharing.
+
+**URL**: [:octicons-tab-external-16: cloud.starcatsys.net](https://cloud.starcatsys.net)  
+**Homepage**: [:octicons-link-external-16: nextcloud.com](https://nextcloud.com/)  
+**Hosting**: [:octicons-arrow-right-16: Hetzner](../servers_and_hosting/hetzner.md) `FSN` 
+
+---
+
+!!! example "Work in Progress"
+    This page is not complete, and is subject to change.
+
+    Want to help with this page? Please see [:octicons-arrow-right-16: Editing this site](https://about.starcat.systems/editing/) and the [:simple-forgejo: Git repo](https://git.starcat.systems/starcatsys/about) for this site.