Update dependencies (#86)

* Update many packages.

* Commit package lock file

* Downgrade chalk

* Downgrade strip-ansi

* Downgrade eslint

* Rebuild lock file

* Update postcss

* Switch to using del because gulp-clean is deprecated

* Harden checks on empty directories

* Update notify

* Early exit if directories don't exist

* Downgrade inquirer due to requiring ESM

* Check if directories exist before using

* Replace lingering plugins.clean usage

* Exclude the build directory

.gitignore

@@ -3,7 +3,6 @@
 /.idea
 /tmp
 /node_modules
-package-lock.json
 .DS_Store
 .env
 npm-debug.log