Update docs and repo infrastructure (#12)

* Move CONTRIBUTING.md to root so it shows up in the GitHub README tabs along with the LICENSE

* Add bug and enhancement tags to issue templates

* Remove contact links from issue config.yml

* Add PR template

* Add docs directory

* Run rubocop autocorrect

* Add frozen_string_literal: true to .rb files

* Exclude _site/ from rubocop lint

* Run rubocop autocorrect

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,7 @@
 name: Bug report
 about: Create a report to help us improve
 title: ''
-labels: ''
+labels: ['bug']
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1 @@
-blank_issues_enabled: false
-contact_links:
-  - name: Ask a question
-    url: https://github.com/kevinlin1/just-the-class/discussions
-    about: Ask questions and discuss with other community members
+blank_issues_enabled: true

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,7 +2,7 @@
 name: Feature request
 about: Suggest an idea for this project
 title: ''
-labels: ''
+labels: ['enhancement']
 assignees: ''
 
 ---

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

@@ -0,0 +1,14 @@
+## Preliminaries
+
+- [ ] I have read CONTRIBUTING.md
+- [ ] I have added tests, if applicable
+- [ ] I have fixed CI issues
+- [ ] I have set reviewer(s), assignee(s), and label(s)
+
+## Summary
+
+Describe what you changed and why.
+
+If this address an issue, mention that it fixes that issue.
+
+Attach screenshots or screen recordings, if helpful.

.rubocop.yml

@@ -1,2 +1,8 @@
+require:
+  - rubocop-rspec
+
 AllCops:
   NewCops: enable
+  Exclude:
+    - '_site/**/*'
+

Gemfile

@@ -1,8 +1,10 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 gem 'github-pages', group: :jekyll_plugins
 gem 'jekyll-sitemap'
-gem 'webrick'
 gem 'just-the-docs'
+gem 'webrick'
 
 group :development, :test do
   gem 'axe-core-capybara'

docs/DELETEME

@@ -0,0 +1 @@
+A temporary file so the docs directory is checked into git

spec/accessibility_spec.rb

@@ -1,4 +1,6 @@
-describe 'course website', type: :feature, js: true do
+# frozen_string_literal: true
+
+describe 'course website', :js, type: :feature do
   before :all do
     visit('/sitemap.xml')
     sitemap_links = page.html.scan(%r{<loc>.+</loc>})

spec/spec_helper.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This file was generated by the `rspec --init` command. Conventionally, all
 # specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
 # The generated `.rspec` file contains `--require spec_helper` which will cause