ci: remove Drone CI

.drone.jsonnet

@@ -1,64 +0,0 @@
-local Pipeline(isDev) = {
-  kind: "pipeline",
-  type: "exec",
-  name: if isDev then "Deploy to dev" else "Deploy to prod",
-  # Dev ignores "master", prod only triggers on "master"
-  trigger: { branch: { [if isDev then "exclude" else "include"]: [ "main" ] } },
-  steps: [
-    {
-      # We want to clone the submodules, which isn't done by default
-      name: "submodules",
-      commands: [
-        "git submodule update --recursive --init",
-      ]
-    },
-    {
-      # Include pre-commit checks, which include markdownlint
-      name: "check",
-      commands: [
-        "nix flake check",
-      ],
-    },
-    {
-      # If dev, include drafts and future articles, change base URL
-      name: "build",
-      commands: [
-        "nix develop -c make " + if isDev then "build-dev" else "build-prod",
-      ],
-    },
-    {
-      name: "deploy",
-      commands: [
-        "nix run github:ambroisie/nix-config#drone-rsync",
-      ],
-      environment: {
-        # Trailing slash to synchronize the folder's *content* to the target
-        SYNC_SOURCE: "public/",
-        SYNC_HOST: { from_secret: "ssh_host" },
-        SYNC_TARGET: { from_secret: "ssh_target" + if isDev then "_dev" else "" },
-        SYNC_USERNAME: { from_secret: "ssh_user" },
-        SYNC_KEY: { from_secret: "ssh_key" },
-        SYNC_PORT: { from_secret: "ssh_port" },
-      },
-    },
-    {
-      name: "notify",
-      commands: [
-        "nix run github:ambroisie/matrix-notifier",
-      ],
-      environment: {
-        ADDRESS: { from_secret: "matrix_homeserver" },
-        ROOM: { from_secret: "matrix_roomid" },
-        USER: { from_secret: "matrix_username" },
-        PASS: { from_secret: "matrix_password" },
-      },
-      when: { status: [ "failure", "success", ] },
-    },
-  ]
-};
-
-
-[
-  Pipeline(false),
-  Pipeline(true),
-]