Json-server should be a dev dependency

[Luke-McMahon]

npm run server
npm WARN config global `--global`, `--local` are deprecated. Use `--location=global` instead.

> [email protected] server
> json-server -p3001 --watch db.json

'json-server' is not recognized as an internal or external command,
operable program or batch file.

npm install -D json-server
npm WARN config global `--global`, `--local` are deprecated. Use `--location=global` instead.

added 60 packages, and audited 1544 packages in 6s

240 packages are looking for funding
  run `npm fund` for details

7 high severity vulnerabilities

To address issues that do not require attention, run:
  npm audit fix

To address all issues (including breaking changes), run:
  npm audit fix --force

Run `npm audit` for details.

npm run server
npm WARN config global `--global`, `--local` are deprecated. Use `--location=global` instead.

> [email protected] server
> json-server -p3001 --watch db.json


  \{^_^}/ hi!

  Loading db.json
  Oops, db.json doesn't seem to exist
  Creating db.json with some default data

  Done

  Resources
  http://localhost:3001/posts
  http://localhost:3001/comments
  http://localhost:3001/profile

  Home
  http://localhost:3001

  Type s + enter at any time to create a snapshot of the database
  Watching...