Upgrading to Polaris inventory - track pages that need to be updated

Make an inventory of all the guide pages that need more updates than just changing the code examples. For example mentioning `hbs` in text, or saying something about building with `ember cli`. Those kind of things

| Page | Comment |
| -------- | ------- |
| Components | Template tag format' should be the beginning |
| Introducing Components | Show 'component' imports, update examples |
| Component Args & HTML attrs | Show 'component' imports, update examples |
| Helper functions | show imports |
| Component State & Actions |   |
| Looping through Lists | Example should be gjs |
| Template Lifecycle DOM & Modifiers | did-insert & did-update modifiers |
| Built-in Components | still recommend? |
| Template tag format | Should be start of component intro |
| Routing - Controller | Controllers should be minimized, maybe example of params in routing doc? |
| Application Concerns | deprecated? |
| Initializers | deprecated? |
| Addons & Dependencies | should we still use "moment"? |
| Ember Inspector |   |
| Upgrading | newer example? |
| Octane Upgrade Guide | should be Polaris Upgrade Guide |
| Glossary | CoffeeScript still relevant? |