Change /motivation command API

[Ta1al]

Added new command [command]

Issue: #130

• [x] Added command to README.md commands list
• [x] Code is tested before submitting
• [x] Code is formatted with prettier (npm run format)
• [x] Deleted all console.log() or console.error() statements
• [x] Correct error handling => No 'The application did not respond' errors

Details

Changed the API to get actual "quotes".

[thieleju]

@Ta1al Hey, I left a comment on this in the issue #130 :) For the future, please first discuss changes in the issue before raising a pr