Querying for dnf provides */fonts/glyphicons-halflings-regular.eot gave some results, but also install R-bslib, R-shiny, python3-XStatic-Bootstrap-SCSS and python3-sphinx-bootstrap-theme did not work.
It requires that you work through the errors one at a time and install the missing file each time until you are successful. This may occur any time you install a 3rd party package that is “out of tree” in the repos. Installing from the fedora and compatible repos usually pulls in the required dependencies, but when out of tree you are required to solve those issues as they are seen.
I don’t know about the html_notebook tool. On my system, using dnf to installR-rmarkdown would pull in 229 different packages, the majority of which are R-* or texlive-* or perl-*. Did you install R-rmarkdown with dnf?
The R-rmarkdown package includes /usr/share/R/library/rmarkdown/rmd/h/bootstrap/fonts/glyphicons-halflings-regular.ttf, but not .eot
I’d guess this is a bug in that package. It strips all the bundled fonts out and replaces them with symlinks to system fonts, but glyphicons-halflings-fonts only includes the .ttf.
I do think a bug report is still warranted. This could be addressed upstream, but it’s ultimately only broken because of a downstream change made to comply with Fedora policy.