Adding tags to html head

[castle-giant]

I've added a tag in the header of ~/.venv/lib/python3.13/site-packages/pelican/themes/notmyidea/templates/base.html (I installed pelican using uv) but when I run 'make clean' I do not see that tag where I expect to see it in the section of the generated html.
Is there another command I should be using or a cache that I need to delete? Or even more broadly am I tackling this the wrong way? Is there a more pythonic/pelicanic way to add tags to the header?

[castle-giant]

edit, ok for some reason I refreshed the page source and now that link is showing up. Still though this seems like a really ugly and fragile way to do it, I'd welcome any suggestions for how to do this in a more elegant fashion.

[justinmayer]

That bundled theme is provided so that users can get started quickly without having to install a theme separately. As soon as one wants to customize a theme, then one should put a copy of the theme in the site project root (perhaps as themes/notmyidea) and reference it in your settings file via a relative path:

THEME = "themes/notmyidea"