deploy_to_branch: Build and deploy a site locally
In Paradigm4/pkgdown: Make Static HTML Documentation for a Package

Assumes that you're in a git clone of the project, and the package is already installed.

deploy_to_branch(
  pkg = ".",
  commit_message = construct_commit_message(pkg),
  clean = FALSE,
  branch = "gh-pages",
  remote = "origin",
  github_pages = (branch == "gh-pages"),
  ...
)

`pkg`	Path to package.
`commit_message`	The commit message to be used for the commit.
`clean`	Clean all files from old site.
`branch`	The git branch to deploy to
`remote`	The git remote to deploy to
`github_pages`	Is this a GitHub pages deploy. If `TRUE`, adds a `CNAME` file for custom domain name support, and a `.nojekyll` file to suppress jekyll rendering.
`...`	Additional arguments passed to `build_site()`.