refactor(docs): enhance PDF build process and font settings

Improves the PDF generation process by adding verbosity and updating
font configurations, ensuring better compatibility and output quality.

- Add "--verbose" to pandoc command for detailed output during PDF
  generation
- Change monofont from "SauceCodePro Nerd Font" to "Noto Sans Mono" for
  improved font rendering
- Switch PDF engine from "pdflatex" to "xelatex" for better Unicode
  support
- Uncomment fontspec package in LaTeX to enable custom font settings
- Add inputenc package and Unicode character declaration for extended
  character support

Signed-off-by: Glenn Y. Rolland <glenux@glenux.net>

utils/docs/build_pdf.py

@@ -39,6 +39,7 @@ print(f"Output: {output_file}")
 
 # Build the pandoc options as a string
 pandoc_cmd = [
+    "--verbose",
     "--toc",
     "--number-sections",
     "--include-in-header", "utils/docs/main.tex",
@@ -47,8 +48,8 @@ pandoc_cmd = [
     # "-V", "geometry:a4paper",
     # "-V", "geometry:margin=1.8cm",
     "-V", "mainfont=DejaVu Serif",
-    "-V", "monofont=SauceCodePro Nerd Font",
+    "-V", "monofont=Noto Sans Mono",
-    "--pdf-engine=pdflatex",
+    "--pdf-engine=xelatex",
     "--resource-path=utils/docs",
     "--filter=./utils/docs/filter-nobg.hs",
 ]

utils/docs/main.tex

@@ -2,6 +2,8 @@
 
 % Set the document language to English
 \usepackage[english]{babel}
+% \usepackage[utf8]{inputenc}
+% \DeclareUnicodeCharacter{21D2}{$\Rightarrow$}
 
 % Adjust page geometry
 \usepackage[
@@ -25,6 +27,6 @@
 \input{utils/docs/hyperref_setup.tex}
 
 % Font settings using fontspec
-% \usepackage{fontspec}
+\usepackage{fontspec}
 % \setmainfont{DejaVu Serif} % Set your main font
 % \setmonofont{SauceCodePro Nerd Font} % Set your monospace (code) font