(docs): Misc Fixes

[mosesintech]

This PR will update the templates example for custom page templates. It will also update the NEXT_SITE_URL env variable documentation to include a note about the trailing slash.

Issue: When following the documented example for adding a custom page template, the following warning was given:

[@nextwp/core] ⚠️ Template "testingTemplate" not found for type "page" on uri 'testing'.
Did you forget to add it to the templates object in src/templates/index?

This PR will add "Template" to the end of the page keys.

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[mosesintech]

I haven't tested it just yet for the other template types.

Do custom post types, custom post templates, and custom archive templates also expect "Template" to the keys?

[mosesintech]

I found that the trailing slash is necessary in the NEXT_SITE_URL env variable, so I add a commit here to add a note to the docs explaining that.

[CalebBarnes]

Issue: When following the documented example for adding a custom page template, the following warning was given:

[@nextwp/core] ⚠️ Template "testingTemplate" not found for type "page" on uri 'testing'.
Did you forget to add it to the templates object in src/templates/index?

How were you adding the templates? Usually this should only happen if your template included the word "template" in the name.

Did you create php files in your wp theme or did you create the templates through the NextWP Toolkit plugin UI?

NextWP Toolkit has this handy feature for creating templates without the need for adding php files, since we are building headless we don't really need anything in the template php file.

With this example in the screenshot, my templates object would look something like

const templates = {
  page: {
    default: DefaultPageTemplate,
    contact: ContactPageTemplate,
  }
}

This would probably be useful info to add to a docs guide like "Adding custom page templates" or similar.

[mosesintech]

Good point, Caleb. I was working too fast and too tired and didn't realize I actually named it Testing Template. Totally my bad.