ci: 🎡 remove legacy build command

Author: streamich

.github/workflows/pr.yml

@@ -37,7 +37,6 @@ jobs:
           cache: yarn
       - run: yarn install --frozen-lockfile
       - run: yarn build
-      - run: yarn build:demo-server
       - run: yarn lint
       - run: yarn prettier:check
       - run: yarn typedoc

.github/workflows/release.yml

@@ -28,7 +28,6 @@ jobs:
       - run: PORT=10002 yarn test:e2e --server http1 --suite json-crdt-server
       - run: PORT=10003 yarn test:e2e --server uws --suite json-crdt-server
       - run: yarn build
-      - run: yarn build:demo-server
       - name: Semantic Release
         uses: cycjimmy/semantic-release-action@v4
         env: