Prior to this PR the HTML head was being
included twice on the password auth page.
One from root.html and another from the
error page, so we decoupled those.
* Render modal components at the end of live views
* Add error pages
* Restructure web module
* Update lib/livebook_web/templates/error/500.html.eex
Co-authored-by: José Valim <jose.valim@dashbit.co>
* Update lib/livebook_web/templates/error/500.html.eex
Co-authored-by: José Valim <jose.valim@dashbit.co>
* Update lib/livebook_web/views/error_view.ex
Co-authored-by: José Valim <jose.valim@dashbit.co>
Co-authored-by: José Valim <jose.valim@dashbit.co>