Make the list of bit users configurable

[jtpio]

Opening an issue to track the following TODO, for visibility:

github-activity/github_activity/github_activity.py

Lines 70 to 90 in 67ad197

	# exclude known bots from contributor lists
	# TODO: configurable? Everybody's got their own bots.
	BOT_USERS = {
	"codecov",
	"codecov-io",
	"dependabot",
	"github-actions",
	"henchbot",
	"jupyterlab-dev-mode",
	"lgtm-com",
	"meeseeksmachine",
	"names",
	"now",
	"pre-commit-ci",
	"renovate",
	"review-notebook-app",
	"support",
	"stale",
	"todo",
	"welcome",
	}