reduce to only pandoc pipeline + fix script according to downstream patches

body.sed

@@ -0,0 +1,32 @@
+/\$\$/ {
+    N;
+    /\\begin\{align\}/ {
+        s/\$\$//;
+        p;
+        d;
+    }
+    /\\newcommand/ {
+        N;
+        d;
+    }
+}
+
+/\\end\{align\}/ {
+    N;
+    /\$\$/ {
+        s/\$\$//;
+        p;
+        d;
+    }
+}
+s/lightgreen/Lime/g;
+s/\{green/\{Green/g;
+s/\{yellow/\{Goldenrod/g;
+s/\{darkorange/\{DarkOrange/g;
+s/:::/::: /g;
+s/\\circ \- \\bullet/\\;\\laplace\\;/g;
+s/\{align/\{align\*/g;
+s/\\color/\\textcolor/g;
+s/\*\*<center>/\\begin{center}\\textbf{/g;
+s/<\/Center>\*\*/}\\end{center}/g;
+