cleans gha (fixes #1163)

Author: Nowosad

.github/workflows/main-no-deploy.yml

@@ -14,6 +14,4 @@ jobs:
       - uses: actions/checkout@v2
       - name: Render Book
         run: |
-          Rscript -e 'remotes::install_dev("tmap")'
-          Rscript -e 'remotes::install_version("xfun", "0.46")'
           Rscript -e 'bookdown::render_book("index.Rmd")'