Add collaborator projection instructions

scripts/setup-rta-mock-docs.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env sh
+set -eu
+
+REPO_URL="${REPO_URL:-http://100.64.0.1:30087/virgil-admin/rta-mock-docs.git}"
+TARGET_DIR="${TARGET_DIR:-$HOME/Developer/Section0/rta-mock-docs}"
+
+if ! command -v git >/dev/null 2>&1; then
+  echo "git is required but was not found on PATH" >&2
+  exit 1
+fi
+
+if [ -d "$TARGET_DIR/.git" ]; then
+  echo "Repo already exists: $TARGET_DIR"
+  git -C "$TARGET_DIR" remote set-url origin "$REPO_URL"
+  git -C "$TARGET_DIR" fetch origin
+  git -C "$TARGET_DIR" checkout main
+  git -C "$TARGET_DIR" pull --ff-only
+else
+  mkdir -p "$(dirname "$TARGET_DIR")"
+  git clone "$REPO_URL" "$TARGET_DIR"
+fi
+
+git -C "$TARGET_DIR" config pull.ff only
+
+cat <<EOF
+Ready.
+
+Repo: $TARGET_DIR
+Remote: $REPO_URL
+
+Daily flow:
+  cd "$TARGET_DIR"
+  git pull --ff-only
+  # edit Markdown
+  git add .
+  git commit -m "Update docs"
+  git push
+
+AFFiNE updates after the projection operator pulls and runs projection.
+EOF