library/library_website/controllers/hello.py

from odoo import http
from odoo.http import request

class Hello(http.Controller):
    @http.route('/helloworld', auth="public",website=True)
    def helloworld(self,**kwargs):
        return request.render('library_website.helloworld')
    
    @http.route('/hellocms/<page>', auth='public', website=True)
    def hello(self, page, **kwargs):
        return request.render(page)