Add section about resetting GitHub PAT

[chendaniely]

example of an error you can get:

> devtools::install_github("UBC-MDS/taxyvr")
Using github PAT from envvar GITHUB_PAT. Use `gitcreds::gitcreds_set()` and unset GITHUB_PAT in .Renviron (or elsewhere) if you want to use the more secure git credential store instead.
Error: Failed to install 'unknown package' from GitHub:
  HTTP error 401.
  Bad credentials

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In R you can help remove PATs:

install.packages("gitcreds")

Then run gitcreds::gitcreds_get() to look for the PAT

Also try:

Sys.getenv("GITHUB_TOKEN")
Sys.getenv("GITHUB_PAT")

To delete the credential, try this:

gitcreds::gitcreds_delete()