old_contents: from PyQt5.QtWidgets import QDialog, QDialogButtonBox, QLabel, QVBoxLayout
  
  from aqt import mw
  
  from ._version import __version__
  
  
  def showAbout():
      dialog = QDialog(mw)
  
      label = QLabel()
      text = '''
  <div style="font-weight: bold; font-size: 16px">Incremental Reading v%s</div>
  <div style="font-size: 14px">Maintainer: Luo Li-Yan</div>
  <div style="font-size: 14px">
  Contributors: Tiago Barroso, Frank Kmiec, Aleksej
  </div>''' % __version__
      label.setText(text)
  
      buttonBox = QDialogButtonBox(QDialogButtonBox.Ok)
      buttonBox.accepted.connect(dialog.accept)
  
      layout = QVBoxLayout()
      layout.addWidget(label)
      layout.addWidget(buttonBox)
  
      dialog.setLayout(layout)
      dialog.setWindowTitle('About')
      dialog.exec_()
  
new_contents: from PyQt5.QtWidgets import QDialog, QDialogButtonBox, QLabel, QVBoxLayout
  
  from aqt import mw
  
  from ._version import __version__
  
  IR_GITHUB_URL = 'https://github.com/luoliyan/incremental-reading-for-anki'
  
  
  def showAbout():
      dialog = QDialog(mw)
  
      label = QLabel()
      label.setStyleSheet('QLabel { font-size: 14px; }')
      text = '''
  <div style="font-weight: bold">Incremental Reading v%s</div>
  <div>Maintainer: Luo Li-Yan</div>
  <div>Contributors: Tiago Barroso, Frank Kmiec, Aleksej</div>
  <div>Website: <a href="%s">%s</a></div>
  ''' % (__version__, IR_GITHUB_URL, IR_GITHUB_URL)
      label.setText(text)
  
      buttonBox = QDialogButtonBox(QDialogButtonBox.Ok)
      buttonBox.accepted.connect(dialog.accept)
  
      layout = QVBoxLayout()
      layout.addWidget(label)
      layout.addWidget(buttonBox)
  
      dialog.setLayout(layout)
      dialog.setWindowTitle('About')
      dialog.exec_()
  
subject: Add website to dialog