* Make the README better
• Replace straight quotes with smart quotes
• Revise Node.js minimum requirement wording (to prevent line breaks)
• Replace old links to LitElement (Polymer) to Lit
• Replace mentions of “NPM” with “npm”, as per https://github.com/npm/cli?tab=readme-ov-file#is-it-npm-or-npm-or-npm
• Fix some grammar and abbreviations
• Made “dependencies” and “devDependencies” mentions unquoted to be consistent
• Correct “MIT license” with “MIT License”, as per https://opensource.org/license/mit
* Make some specific changes to make wording more clear
* add missing dot
* remove smart quotes