Add Docmost markdown file and screenshots

Author: GilbN

docs/site_assets/docmost/hotline.png

@@ -0,0 +1,7 @@
+{% set github_link = "https://github.com/docmost/docmost" %}
+
+{% include-markdown "../themes/title.md" %}
+
+{% include-markdown "../themes/installation.md" %}
+
+{% include-markdown "../themes/screenshots.md" %}

docs/site_assets/docmost/logo.png

@@ -115,6 +115,7 @@ nav:
       Flood: themes/flood.md
       Audiobookshelf: themes/audiobookshelf.md
       Uptime-Kuma: themes/uptime-kuma.md
+      Docmost: themes/docmost.md
       TheLounge ❌🐳: themes/thelounge.md
       Grafana ❌⚙️: themes/grafana.md
       Monitorr ❌⚙️: themes/monitorr.md