App Submission: flatnotes (#3895)

Co-authored-by: Alexander L. <lackner.alex@gmail.com>

flatnotes/docker-compose.yml

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+services:
+  app_proxy:
+    environment:
+      APP_HOST: flatnotes_server_1
+      APP_PORT: 8080
+      PROXY_AUTH_ADD: "false"
+
+  server:
+    image: dullage/flatnotes:v5.5.4@sha256:a509830073d6548d35450a98be3a432716430b674cc70ac93cbbaed1555b5a28
+    environment:
+      PUID: 1000
+      PGID: 1000
+      FLATNOTES_AUTH_TYPE: "password"
+      FLATNOTES_USERNAME: "admin"
+      FLATNOTES_PASSWORD: ${APP_PASSWORD}
+      FLATNOTES_SECRET_KEY: ${APP_SEED}
+    restart: on-failure
+    stop_grace_period: 1m
+    volumes:
+      - ${APP_DATA_DIR}/data:/data

flatnotes/umbrel-app.yml

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+manifestVersion: 1
+id: flatnotes
+category: files
+name: flatnotes
+version: "5.5.4"
+tagline: A self-hosted, database-less markdown note-taking app
+description: >
+  📝 Flatnotes is a clean, self-hosted note-taking app that treats your ideas with respect. Every note you write lives as a plain Markdown file in a simple folder on your own server. 
+  No databases lurking in the background, no vendor lock-in, no complicated structure. You remain in full control of your thoughts and your data at all times.
+
+
+
+  The interface keeps distractions out of the way so you can focus entirely on writing. Quickly create notes, add tags, and jump across your knowledge with powerful full-text search.
+  Wikilinks make it effortless to connect ideas, turning your notes into a personal knowledge network. Switch between raw Markdown and a polished WYSIWYG editor whenever your mood shifts.
+
+
+
+  Flatnotes stays lightweight yet capable. Everything syncs instantly, even if you edit files outside the app.
+  Browse from any device with a responsive design that feels right whether you are at your desk or out in the world. 
+  Theming keeps your space cozy with beautiful light and dark modes.
+
+
+
+  Flatnotes frees your notes from proprietary cages and lets them breathe as future-proof Markdown. 
+  It can serve as your personal journal, research companion, digital garden, or anything else your creativity grows into. Pure writing. Pure ownership. Zero noise.
+developer: Adam Dullage
+website: https://github.com/dullage/flatnotes
+dependencies: []
+repo: https://github.com/dullage/flatnotes
+support: https://github.com/dullage/flatnotes/issues
+port: 8523
+gallery:
+  - 1.jpg
+  - 2.jpg
+  - 3.jpg
+path: ""
+defaultUsername: "admin"
+deterministicPassword: true
+releaseNotes: ""
+submitter: Kanishk Pachauri
+submission: https://github.com/getumbrel/umbrel-apps/pull/3895