chore: Improve news path parsing when listing Arch news

The command historically used for news path parsing was chaining multiple 'sed' calls in an unoptimized way. Everything is now merged into a single 'sed' call.

src/lib/list_news.sh

@@ -69,7 +69,7 @@ else
 			if [ "${num}" -le "${news_num}" ] 2> /dev/null && [ "${num}" -gt "0" ]; then
 				printed_news="true"
 				news_selected=$(sed -n "${num}"p <<< "${news_titles}")
-				news_path=$(echo "${news_selected}" | sed s/\ -//g | sed s/\ /-/g | sed s/[.]//g | sed s/=//g | sed s/\>//g | sed s/\<//g | sed s/\`//g | sed s/://g | sed s/+//g | sed s/[[]//g | sed s/]//g | sed s/,//g | sed s/\(//g | sed s/\)//g | sed s/[/]//g | sed s/@//g | sed s/\'//g | sed s/--/-/g | awk '{print tolower($0)}')
+				news_path=$(echo "${news_selected}" | sed -E 's/[.=><`:+@,()\[\]'"'"']//g; s/ /-/g; s/--/-/g' | tr '[:upper:]' '[:lower:]')
 				news_url="https://www.archlinux.org/news/${news_path}"
 				news_content=$(curl -m 30 -Lfs "${news_url}" || echo "error")