chore: simplify github actions (#4367)

* Update deploy-4x.yml

* Delete release.yml

* Delete npm-publish.yml

* Delete mirror.yml

* Update deploy-4x.yml

* Update ci.yml

.github/workflows/ci.yml

@@ -1,6 +1,6 @@
 name: CI
 
-on: ["push", "pull_request"]
+on: [push]
 
 jobs:
   lint:

.github/workflows/deploy-4x.yml

@@ -16,10 +16,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - run: git checkout master
       - run: yarn install
       - run: npm run site:build
       - run: |
-          git checkout master
           cd public
           git init
           git config --local user.name antv