old_contents: import os
  from flask import Flask, redirect, request, render_template
  from flask_mail import Mail, Message
  
  app = Flask (__name__)
  ALLOWED_EXTENSIONS = set(['txt', 'png', 'jpg', 'jpeg'])
  mail = Mail(app)
  
  @app.route("/")
  def index():
      return render_template('in-development.html.j2')
  
  if __name__ == "__main__":
      app.run(host='0.0.0.0')
  
new_contents: import os
  from flask import Flask, redirect, request, render_template
  from flask_mail import Mail, Message
  
  app = Flask (__name__)
  ALLOWED_EXTENSIONS = set(['txt', 'png', 'jpg', 'jpeg'])
  mail = Mail(app)
  
  @app.route("/")
  def index():
      return render_template('index.html.j2')
  
  if __name__ == "__main__":
      app.run()
  
subject: Split into new branch for development of the main site