LMT Zeppelin Dark Theme

Support dark theme for Zeppelin (localhost, 8080 port) and zepl.com website.

Changelog:
0.1.4
- Local
- Background color fix for warning box (truncate warning box, for instance).

- Zepl.com
(No changes).

0.1.3
- Zepl
- https://www.zepl.com/account "Edit Account" button fix.
- Table display fix.
- Notebook circle loader icon now with dark background.
- Code comment color update.
- Fix color of table/chart settings.

- Local
- Fix dark text in header drop down (Notebook, profile).
- Fix setting panel color.
- Text color of button tooltip in paragraph fix.
- Fix drop down download text color.

0.1.2
- Zepl.com
- Fix drop down, inputs may have white background with white text when being hovered.

- Local Zeppelin
- (No changes)

0.1.1
- Zepl.com
- Fix text color in <td> tag.
- Input background was set to black with white text color as default.
- Scalable font-size for codes in paragraph.
- Code line with dark color.
- Improve styles.

- Local Zeppelin
- Code line with dark color.
- Code colors for keywords, functions,… were improved.
- Improve styles.