docs: Update GitHub default branch from to 'main' (#1883)

docs/deploy.md

@@ -7,14 +7,14 @@ Similar to [GitBook](https://www.gitbook.com), you can deploy files to GitHub Pa
 There are three places to populate your docs for your GitHub repository:
 
 - `docs/` folder
-- master branch
+- main branch
 - gh-pages branch
 
-It is recommended that you save your files to the `./docs` subfolder of the `master` branch of your repository. Then select `master branch /docs folder` as your GitHub Pages source in your repository's settings page.
+It is recommended that you save your files to the `./docs` subfolder of the `main` branch of your repository. Then select `main branch /docs folder` as your GitHub Pages source in your repository's settings page.
 
 ![GitHub Pages](_images/deploy-github-pages.png)
 
-!> You can also save files in the root directory and select `master branch`.
+!> You can also save files in the root directory and select `main branch`.
 You'll need to place a `.nojekyll` file in the deploy location (such as `/docs` or the gh-pages branch)
 
 ## GitLab Pages