Reduced steps for local development setup for social media auth (#1374) (#1383)

This is related to ticket #1374, and simplifies the steps for local
development environments to have a working login flow for github and
google.

The improvements were configuration for the client id and secret for
google and github via .env vars instead of having to go through setting
up "Social Applications" via the admin interface, and automating the
process for creating google cloud projects in which oauth clients can be
created. Documentation was adjusted to fit.

That was as far as this could be automated given limitations on both
Google Cloud Platform and Github's APIs for creating oauth clients/apps.

The terraform process can be improved if these tickets see some progress
or an API comes about to support this.

Google
https://github.com/hashicorp/terraform-provider-google/issues/16452
https://issuetracker.google.com/issues/116182848

Github
https://github.com/integrations/terraform-provider-github/issues/786

.gitignore

@@ -163,3 +163,43 @@ static/css/styles.css
 *.code-workspace
 .vscode/settings.json
 .idea
+
+# TERRAFORM/TOFU
+
+# Local .terraform directories
+**/.terraform/*
+
+# .tfstate files
+*.tfstate
+*.tfstate.*
+
+# Crash log files
+crash.log
+crash.*.log
+
+# Exclude all .tfvars files, which are likely to contain sensitive data, such as
+# password, private keys, and other secrets. These should not be part of version
+# control as they are data points which are potentially sensitive and subject
+# to change depending on the environment.
+*.tfvars
+*.tfvars.json
+
+# 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
+
+# Ignore transient lock info files created by terraform apply
+.terraform.tfstate.lock.info
+
+# 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*
+
+# Ignore CLI configuration files
+.terraformrc
+terraform.rc