Support \origof and \imageof (#2283)

* Support \origof and \imageof

* Fix documentation table

Co-authored-by: ylemkimon <mail@ylem.kim>

docs/support_table.md

@@ -487,6 +487,7 @@ use `\ce` instead|
 |\iint|$\iint$||
 |\Im|$\Im$||
 |\image|$\image$||
+|\imageof|$\imageof$||
 |\imath|$\imath$||
 |\impliedby|$P\impliedby Q$|`P\impliedby Q`|
 |\implies|$P\implies Q$|`P\implies Q`|
@@ -780,6 +781,7 @@ use `\ce` instead|
 |\operatorname\*|$\operatorname{asin}\limits_y x$|`\operatorname{asin}\limits_y x`|
 |\oplus|$\oplus$||
 |\or|<span style="color:firebrick;">Not supported</span>||
+|\origof|$\origof$||
 |\oslash|$\oslash$||
 |\otimes|$\otimes$||
 |\over|${a+1 \over b+2}+c$|`{a+1 \over b+2}+c`|