Modernizing many things

- use hashicorp/setup-terraform action
- bump terraform requirement to 0.13
- bump digitalocean provider requirement to 1.22
- bump to latest nvm
- remove a bunch of unnecessary quotes

.gitignore

@@ -1,29 +1,8 @@
-# Local .terraform directories
 **/.terraform/*
-
-# .tfstate files
 *.tfstate
 *.tfstate.*
-
-# Crash log files
-crash.log
-
-# Ignore any .tfvars files that are generated automatically for each Terraform run. Most
-# .tfvars files are managed as part of configuration and so should be included in
-# version control.
-#
-# example.tfvars
-
-# Ignore override files as they are usually used to override resources locally and so
-# are not checked in
-override.tf
-override.tf.json
 *_override.tf
 *_override.tf.json
-
-# Include override files you do wish to add to version control using negated pattern
-#
-# !example_override.tf
-
-# Include tfplan files to ignore the plan output of command: terraform plan -out=tfplan
-# example: *tfplan*
+crash.log
+override.tf
+override.tf.json