removing the docs_pr1.yml

require some more modification to migrate from travis ci to github actions

.github/workflows/docs_pr1.yml

@@ -1,11 +0,0 @@
-name : docs_PR_1
-on:
-  pull_request:
-    branches:  [master]
-    paths:
-      - 'docs/**'
-jobs:
-  docs_on_PR:
-    runs-on: windows-latest
-    steps:
-      - run: echo "this job will trigger docs_PR2 workflow on pull request on changes in the docs"