fix(scripts): use ts-node for start script

[caugner]

Before

% npm start

> [email protected] start
> node app.js

node:internal/modules/cjs/loader:1228
  throw err;
  ^

Error: Cannot find module '/Users/claas/github/openwebdocs/mdn-bcd-collector/app.js'
    at Module._resolveFilename (node:internal/modules/cjs/loader:1225:15)
    at Module._load (node:internal/modules/cjs/loader:1051:27)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:174:12)
    at node:internal/main/run_main_module:28:49 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}

Node.js v20.18.0

After

% npm start

> [email protected] start
> node --loader=ts-node/esm --no-warnings=ExperimentalWarning app.ts

info: Listening on port 8080 (HTTP)
info: Press Ctrl+C to quit.