Add support for LaTeX inline and block expressions. (#4446)

* Add support for LaTeX inline and block expressions. (#4364)

Co-authored-by: Tom Moor <tom@getoutline.com>

* tsc

* Show heading markers when LaTeX block is being edited

* Tab to space, name katex chunk

* Fork htmldiff, add support for math nodes

Co-authored-by: luisbc92 <luiscarlos.banuelos@gmail.com>

app/scenes/KeyboardShortcuts.tsx

@@ -339,6 +339,14 @@ function KeyboardShortcuts() {
             shortcut: <Key>{"```"}</Key>,
             label: t("Code block"),
           },
+          {
+            shortcut: (
+              <>
+                <Key>$$</Key> <Key>Space</Key>
+              </>
+            ),
+            label: t("LaTeX block"),
+          },
           {
             shortcut: <Key>{":::"}</Key>,
             label: t("Info notice"),
@@ -359,6 +367,10 @@ function KeyboardShortcuts() {
             shortcut: "`code`",
             label: t("Inline code"),
           },
+          {
+            shortcut: "$latex$",
+            label: t("Inline LaTeX"),
+          },
           {
             shortcut: "==highlight==",
             label: t("Highlight"),