fix ask and todo footnote commands

tex/header/preamble.tex

@@ -97,8 +97,8 @@
 \usepackage{enumitem}
 
 \usepackage{soul} % for highlighting
-\DeclareRobustCommand{\todo}[1]{{\sethlcolor{yellow}\hl{\footnote{\sethlcolor{yellow}\hl{#1}}}}}
-\DeclareRobustCommand{\ask}[1]{{\sethlcolor{Lavender}\hl{\footnotemark}\footnotetext{\sethlcolor{Lavender}\hl{#1}}}}
+\DeclareRobustCommand{\todo}[1]{\textcolor{Blue}{\textbf{\footnotemark}}\footnotetext{\sethlcolor{SkyBlue}\hl{#1}}}
+\DeclareRobustCommand{\ask}[1]{\textcolor{BrickRed}{\textbf{\footnotemark}}\footnotetext{\sethlcolor{Lavender}\hl{#1}}}
 
 \hfuzz=3cm
 \overfullrule=2cm   % marks overfull lines with black box