Stellar_G introduced Component 2, a lightweight UI theme based on the Rainbow Theme, featuring minor CSS tweaks and visual previews including the homepage, hamburger menu, and new topic interface. The theme is available for preview and installation via Theme Creator and its GitHub repo. However, users like Diego_Santos noted the hamburger menu is missing, which Stellar_G confirmed was originally inherited from Discourse’s default theme but has since been removed — and they lack the expertise to restore it. JammyDodger suggested tagging the theme as deprecated, which Stellar_G agreed to. The theme is now marked as deprecated and not actively maintained.
No, back when I made the theme it was included in the original code. I tried running it again and I have the same problem as you do. I’m pretty sure when I made it the hamburger menu was in the default theme for Discourse and so I had just changed a couple of colors. I haven’t been on the website in three years and it looks like it has been removed. Admittedly, I have very little experience with Discourse so I don’t know how I would be able to re-implement it, but best of luck!