chore: remove ci configuration

Both pipelines are unused — GitLab CI is no longer in use, and the Gitea
workflow was never enabled. Deployment is currently run by hand, so no
replacement automation is added here.

.gitea/workflows/deploy.yml

@@ -1,68 +0,0 @@
-name: Deploy
-
-on:
-  push:
-    branches: [main]
-  workflow_dispatch:
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: 24
-
-      - name: Setup pnpm
-        run: corepack enable pnpm
-
-      - name: Install dependencies
-        run: pnpm install --frozen-lockfile
-
-      - name: Build
-        run: pnpm build
-
-      - uses: actions/upload-artifact@v3
-        with:
-          name: doc-build
-          path: doc_build/
-
-  deploy-vercel:
-    needs: build
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: actions/download-artifact@v3
-        with:
-          name: doc-build
-          path: doc_build/
-
-      - name: Deploy to Vercel
-        run: npx vercel deploy --prod --yes --token ${{ secrets.VERCEL_TOKEN }}
-        env:
-          VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}
-          VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
-
-  deploy-onixbyte:
-    needs: build
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/download-artifact@v3
-        with:
-          name: doc-build
-          path: doc_build/
-
-      - name: Deploy to OnixByte.cn
-        env:
-          DEPLOY_KEY: ${{ secrets.DEPLOY_SSH_KEY }}
-        run: |
-          apt-get update -qq && apt-get install -y -qq rsync
-          mkdir -p ~/.ssh
-          printf '%s\n' "$DEPLOY_KEY" > ~/.ssh/id_ed25519
-          chmod 600 ~/.ssh/id_ed25519
-          ssh-keyscan onixbyte.cn >> ~/.ssh/known_hosts
-          rsync -avz --delete doc_build/ root@onixbyte.cn:${{ vars.DEPLOY_PATH }}

.gitlab-ci.yml

@@ -1,38 +0,0 @@
-workflow:
-  rules:
-    - if: $CI_COMMIT_BRANCH == "main"
-
-stages:
-  - build
-  - deploy
-
-build:
-  stage: build
-  image: node:24.15-trixie-slim
-  before_script:
-    - corepack enable
-    - corepack prepare pnpm@latest --activate
-    - pnpm config set store-dir .pnpm-store
-  script:
-    - pnpm install --frozen-lockfile
-    - pnpm build
-  artifacts:
-    paths:
-      - doc_build/
-
-deploy:
-  stage: deploy
-  image: alpine:latest
-  needs:
-    - build
-  before_script:
-    - apk add --no-cache openssh-client rsync
-    - mkdir -p ~/.ssh
-    - echo "$SSH_PRIVATE_KEY_BASE64" | base64 -d > ~/.ssh/id_ed25519
-    - chmod 600 ~/.ssh/id_ed25519
-    - ssh-keyscan -H onixbyte.cn >> ~/.ssh/known_hosts
-  script:
-    - rsync -avz --delete doc_build/ ${SSH_USER}@onixbyte.cn:${DEPLOY_PATH}
-    - ssh ${SSH_USER}@onixbyte.cn "chown -R caddy:caddy ${DEPLOY_PATH} && chmod -R 755 ${DEPLOY_PATH}"
-  rules:
-    - if: $CI_COMMIT_BRANCH == "main"