Move codeEditor to components directory

This simply moves the codeEditor folder to the components directory.  `codeEditor.jsx` simply builds a component which is then used elsewhere, and isn't shared between client and server, so it should be in the client directory.

Arguably it could go in `client/homebrew/editor` but I think the `/homebrew/` folder should be eliminated down the line and it's contents just re-sorted.

When working on the editor right now it's a pain to switch between `shared` and `client` hunting for the right file.

client/homebrew/editor/editor.jsx

@@ -6,7 +6,7 @@ const _ = require('lodash');
 const dedent = require('dedent-tabs').default;
 import Markdown from '../../../shared/naturalcrit/markdown.js';
 
-const CodeEditor = require('naturalcrit/codeEditor/codeEditor.jsx');
+const CodeEditor = require('client/components/codeEditor/codeEditor.jsx');
 const SnippetBar = require('./snippetbar/snippetbar.jsx');
 const MetadataEditor = require('./metadataEditor/metadataEditor.jsx');