Deleting comics and tracker sections

Forgoing the use of page assets for Rastered webcomic. Will be adding
its own index file in next commit.
Discovered the post_url site configuration parameter which defines the
output folders. Therefore, I am changing the structure of the tracker
items. Will also be adding index files for these 2 items.
Re-uploading comics and tracker sections

Different file structures have been adopted.
Index has been updated to access the new links