message: doc: Remove label from good first issue template
diff: name: Good first issue
  about: '(Regular devs only): Suggest a new good first issue'
  title: ''
  -labels: good first issue
  +labels: ''
  assignees: ''
  ---
  +<!-- Needs the label "good first issue" assigned manually before or after opening -->
  +
  <!-- A good first issue is an uncontroversial issue, that has a relatively unique and obvious solution -->
  <!-- Motivate the issue and explain the solution briefly -->
  