fix: fixed v2 routing for development mode for Netlify Edge Functions

[nickytonline]

Description

#110 fixed a deployment issue where the template was using the new v2 routing for Remix, but the file was incorrectly named, i.e. index.tsx instead of `_index.tsx". I hadn't tested this with the dev server, which currently will serve up a blank page as the route isn't loaded because the future config is missing from development mode.

Related Tickets & Documents

• Related Issue Error while deploying app with Edge Functions #110
• Closes #

QA Instructions, Screenshots, Recordings

You can ignore the deploy preview. There is nothing there.

1. Pull this down, e.g. via the GitHub CLI, gh co 112
2. From the root of the project, run npx create-remix@latest --template ./
3. Choose a folder to generate the remix app. Ensure it's outside of the template project. Othewise, you'll receive the following error ⠋ Creating your app…Cannot copy './' to a subdirectory of itself, '/Users/nicktaylor/dev/work/remix-template/my-remix-app'..

➜ npx create-remix@latest --template ./             
? Where would you like to create your app? (./my-remix-app) 

4. Choose TypeScript (the default). It doesn't matter if you choose JavaScript or TypeScript for this fix.

? TypeScript or JavaScript? (Use arrow keys)
❯ TypeScript 
  JavaScript

5. Install the dependencies

? Do you want me to run `npm install`? (Y/n)

6. Select Netlify Edge Functions

💿 Running remix.init script
? Run your Remix site with: 
  Netlify Functions - Choose this for stable support for production sites 
❯ Netlify Edge Functions (beta) - Try this for improved performance on less critical sites

7. From the shell, switch to the root of your new project, e.g. cd ../my-project
8. Run netlify dev
9. The site loads up at http://localhost:8888
10. Stop the development server.
11. Ensure the site still serves correctly for production by running netlify serve
12. The site loads up at http://localhost:8888

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✅ Deploy Preview for remix-edge-on ready!

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