chore(self-hosting): include photoprism and a generic article

knowledge base/self-hosting.md

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+# Self-hosting
+
+The _art_ of hosting and managing applications on one's own servers instead of consuming them from
+[SaaSS][service as a software substitute] providers.
+
+1. [Software](#software)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## Software
+
+| Name             | Description                | Alternatives                      |
+| ---------------- | -------------------------- | --------------------------------- |
+| [Baikal]         | CalDAV and CardDAV server  | [Radicale](https://radicale.org/) |
+| [Gitea]          | Git server                 | [Gitlab]                          |
+| [Gitlab]         | Git server                 | [Gitea]                           |
+| [Home Assistant] | Home automation platform   |                                   |
+| [NextCloud]      | File sharing platform      | [OwnCloud](https://owncloud.com/) |
+| [Paperless-ngx]  | Document management system |                                   |
+| [PhotoPrism]     | Google Photos replacement  |                                   |
+
+## Further readings
+
+### Sources
+
+- [awesome-selfhosted]<br/>
+  List of software network services and web applications which can be hosted privately.
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- Knowledge base -->
+[baikal]: baikal.md
+[gitea]: gitea.md
+[gitlab]: gitlab.md
+[nextcloud]: nextcloud.md
+[paperless-ngx]: paperless-ngx.md
+[photoprism]: photoprism.md
+
+<!-- Others -->
+[awesome-selfhosted]: https://awesome-selfhosted.net/
+[home assistant]: https://www.home-assistant.io/
+[service as a software substitute]: https://www.gnu.org/philosophy/who-does-that-server-really-serve.html