Allow only one h1 tag on every page

@ikenderham

editor.on('component:add', component => {
            const tag = component.get('tagName')
            if (tag == 'h1') {
                if (editor.getComponents().filter(comp => comp.get('tagName') == tag).length > 1) {
                    component.remove()
                }
            }
        })

cheers!

You are so nice! How can I thank you?? Thanks alot! Khdafesممنون I will try this example tomorrow on work. I just follwed you on github !