Remove Joplin

I decided not to use this.

roles/joplin/tasks/main.yml

@@ -1,19 +0,0 @@
----
-# Database setup needs to happen manually for now
-- name: Install the container
-  become: true
-  community.docker.docker_container:
-    name: joplin-server
-    image: "etechonomy/joplin-server:{{ joplin_version }}"
-    ports:
-      - "127.0.0.1:4638:22300/tcp"
-    env:
-      APP_BASE_URL: "https://joplin.kleinendorst.info"
-      APP_PORT: "22300"
-      DB_CLIENT: "pg"
-      POSTGRES_DATABASE: "joplin"
-      POSTGRES_USER: "joplin"
-      POSTGRES_PASSWORD: "{{ joplin_database_password }}"
-      POSTGRES_PORT: "5432"
-      POSTGRES_HOST: "postgres.kleinendorst.info"
-    restart_policy: always

roles/joplin/vars/main/defaults.yml

@@ -1,2 +0,0 @@
----
-joplin_version: '3.0.1'

roles/joplin/vars/main/vault.yml

@@ -1,9 +0,0 @@
-$ANSIBLE_VAULT;1.1;AES256
-66353035323739633736643935333332393265626666363731316565616134333634656464386333
-3932646638373135326166343563316534626537336237310a353661323138613938663737643464
-31326532366137653638623132353036306531666133616463613330393935353864623537383165
-3837326335313234360a346264633134616336623265363636653862666237326433643135326637
-35613136393534643461353431333336356636346363323638623531316138313663336562373334
-34303765316439653236643062343139616264613532623538376162343637383036663030396539
-33383537653736633231393339396639396262383366633965653561363364336133313365623366
-30376264653339616634