New Settings Menu, Routes and Controllers Organization (#641)

* Add new settings routes and controllers

* Add new settings view, restructure controllers and routes

* Fix lint errors

test/system/settings_test.rb

@@ -0,0 +1,66 @@
+require "application_system_test_case"
+
+class SettingsTest < ApplicationSystemTestCase
+  setup do
+    sign_in @user = users(:family_admin)
+
+    @settings_links = [
+      [ "Account", "Account", settings_profile_path ],
+      [ "Preferences", "Preferences", settings_preferences_path ],
+      [ "Notifications", "Notifications", settings_notifications_path ],
+      [ "Security", "Security", settings_security_path ],
+      [ "Billing", "Billing", settings_billing_path ],
+      [ "Accounts", "Accounts", accounts_path ],
+      [ "Categories", "Categories", transactions_categories_path ],
+      [ "Merchants", "Merchants", transactions_merchants_path ],
+      [ "Rules", "Rules", transactions_rules_path ],
+      [ "What's New", "What's New", changelog_path ],
+      [ "Feedback", "Feedback", feedback_path ],
+      [ "Invite friends", "Invite friends", invites_path ]
+    ]
+  end
+
+  test "can access settings from sidebar" do
+    open_settings_from_sidebar
+    assert_selector "h1", text: "Account"
+    assert_current_path settings_profile_path
+  end
+
+  test "all settings views and links are accessible" do
+    open_settings_from_sidebar
+
+    @settings_links.each_with_index do |(link_text, header_text, path), index|
+      next_setting_path = @settings_links[index + 1][2] if index < @settings_links.size - 1
+      prev_setting_path = @settings_links[index - 1][2] if index > 0
+
+      find_link(link_text, exact: true).click
+
+      assert_selector "h1", text: header_text
+      assert_current_path path
+      assert_link "Next", href: next_setting_path if next_setting_path.present?
+      assert_link "Back", href: prev_setting_path if prev_setting_path.present?
+    end
+
+    # Conditional nav items don't show by default
+    assert_no_text "Self Hosting"
+  end
+
+  test "can see conditional nav items" do
+    ENV["SELF_HOSTING_ENABLED"] = "true"
+
+    open_settings_from_sidebar
+
+    click_link "Self Hosting"
+    assert_selector "h1", text: "Self Hosting"
+  end
+
+  test "clicking back or hitting escape key takes user back page they opened settings from" do
+    # TODO: Implement test for back navigation and escape key functionality.
+  end
+
+  private
+    def open_settings_from_sidebar
+      find("#user-menu").click
+      click_link "Settings"
+    end
+end