rename Editor -> ExprBlock

src/Editor.css

@@ -1,39 +0,0 @@
-.editor {
-  padding: 2px;;
-}
-.editor.error {
-  border: 1px solid red;
-  display: inline-block;
-}
-.editor.unknown {
-  border: 1px dashed dodgerblue;
-  display: inline-block;
-}
-
-*:hover:not(:has(> *:hover)) {
-  /* useful for debugging: */
-  /* border-width: 2px !important; */
-}
-
-.offending .error {
-  background-color: transparent;
-}
-
-.typeSignature {
-  display: inline-block;
-  z-index: 1;
-}
-
-.editor:hover > .typeSignature {
-  display: inline-block;
-}
-
-.commandInput {
-  width: 30px;
-  margin-left: 10px;
-}
-
-.keyword {
-  color: blue;
-  font-weight: bold;
-}