Cease supporting Docker deployments altogether

Other changes:
* Do not use Funkwhale's CI, GitPod, etc
* Support Taskfile.yml (might make future CI builds easier)

Signed-off-by: Shin'ya Minazuki <shinyoukai@laidback.moe>

api/Taskfile.yml

@@ -0,0 +1,19 @@
+# https://taskfile.dev
+
+version: '3'
+
+vars:
+  TASK_LIST: task -l
+tasks:
+  default:
+    cmds:
+      - echo "See all available tasks with {{.TASK_LIST}}"
+    silent: true
+  install:
+    desc: Install required dependencies
+    cmds:
+      - poetry install
+  lint:
+    desc: Format source code
+    cmds:
+      - poetry run pylint --recursive=true config funkwhale_api tests