Update contributed library instruction

Author: Qianqianye

src/templates/pages/libraries/README.md

@@ -1,6 +1,5 @@
 # Libraries page
 
-* The index.hbs file contained here is auto-generated. To make changes, do not edit this file directly.
 * Contributed libraries are submitted via [this form](https://docs.google.com/forms/d/e/1FAIpQLSdWWb95cfvosaIFI7msA7XC5zOEVsNruaA5klN1jH95ESJVcw/viewform), and here are the [form responses](https://drive.google.com/drive/u/0/folders/1DNsXp3s35NX_T4Unq4kRvH3i2TSoh44w).
 * To add a library:
   * Go to `src/data/libraries/` and add an entry into the `libraries.json` file. Entries are listed alphabetically.
@@ -9,4 +8,4 @@
   * Run `npm run watch` to build the site, and you should see the new library added to p5js.org/libraries.
   * Gray out the name of the library in the [form responses](https://drive.google.com/drive/u/0/folders/1DNsXp3s35NX_T4Unq4kRvH3i2TSoh44w) sheet, so we know it's been added.
   * (Optional) Post on IG and Twitter that the library has been added, tagging the creator if they provided their username.
-* To make changes to the libraries page template, you can edit `libraries.ejs`.
+* To make changes to the libraries page template, you can edit `libraries.ejs`.