Component now includes scoped styles

This means we no longer need the CSS, the Vue component will handle the
CSS & correctly scope it the components

app/assets/stylesheets/application.scss

@@ -7,7 +7,6 @@
  *= require_self
  *= require dropzone/basic
  *= require cropper.css
- *= require notebooklab.css
 */
 /*

vendor/assets/stylesheets/notebooklab.css

-.cell,
-.input,
-.output {
-  display: flex;
-  width: 100%;
-  margin-bottom: 10px;
-}
-
-.cell:not(.text-cell) {
-  flex-direction: column;
-}
-
-.prompt {
-  padding: 0 10px;
-  min-width: 7em;
-  font-family: monospace;
-}
-
-.cell pre {
-  margin: 0;
-  width: 100%;
-}
-
-.markdown .katex {
-  display: block;
-  text-align: center;
-}