Delete watch.sh

I split the two tsc and linting up because sending to the background in
a script means I can't easily kill them again with `jobs`.

watch.sh

@@ -1,16 +0,0 @@
-#!/bin/sh
-
-ls *.ts* | entr yarn lint | tee >(
-  while read ln; do 
-    if echo "${ln}" | grep -q "error"; then 
-      notify-send "${ln}"
-    fi
-  done
-) &
-yarn tsc --watch --preserveWatchOutput | tee >(
-  while read ln; do 
-    if echo "${ln}" | grep -q "Found [^0][0-9]* error"; then 
-      notify-send "${ln}"
-    fi
-  done
-) &