Add basic volume example and clarify basic surface example

Adding underlying files for logo

Adapting MNE Python gen_rst sphinxext for thumbnails

Change name of label example for ordering

Change name of contour example for ordering

Fix gen_rst so example index isn't double-headered

Delete montage example for now

Move view example for ordering

Rename view example

Improve code and aesthetics of parc values example

Updating basic volume example further

Name full and thumb images differently in gen_rst

Track volume mask file

Change datatype of mask file for better storage

Demonstrate alpha in parcellation example

Unify license statements across the package

Change example README as it is now incorporated into the docs page

Change view in label example

Updating website banner

Converting README to markdown and updating some aspects of it

Flattening and tweaking doc index

Increasing the size of the example thumbnails

Update Alex's affiliation

removing large files