DoubleWiki currently uses a mixture of inline style attributes and deprecated presentational HTML attributes (width, valign etc.) for styling its output. It should use classes and ResourceLoader CSS modules instead.
Acceptance Criteria
- A CSS/LESS ResourceLoader module is created containing all the styling needed for the extension (probably plain CSS is enough here).
- DoubleWiki.php loads that module using OutputPage::addModuleStyles if the extension will certainly output something (i.e. in line 89).
- No inline CSS or presentational attributes remain in DoubleWiki.php.