remove unused package causing CI errors

Author: Mesabloo

preamble.tex

@@ -41,7 +41,4 @@
 \usepackage{multirow}
 \usepackage{makecell}
 \usepackage[bottom]{footmisc}
-\usepackage{pagecolor}
-\usepackage{afterpage}
 \usepackage{tcolorbox}
-\usepackage[book]{FiraSans}