Broken link for responsive display documentation

[gvanhorne]

The project folder created using observable create includes a broken link in the index.md file for documentation pointing toward resize.

Expected Behavior

Link leads to documentation for responsive displays.

Current Behavior

Page is not found.

Possible Solution

Update link to a valid page on the observable hq website.

Steps to Reproduce

1. Create a project using npm init "@observablehq"
2. Start the web server using npm run dev
3. Click the link at the bottom of the page
   
4. Check if page is found
   

Context (Environment)

VSCode Remote Development environment running WSL Ubuntu 22.04

Possible Implementation

Update anchor href attribute from "https://observablehq.com/framework/display#responsive-display" to "https://observablehq.com/framework/javascript#responsive-display".