Updated documentation for v1

Related to #418 (closed), #592 (closed)

• switch to an mkdocs and material ui based system

Overhawl the docs

• introduction
• gui upload
• gui exploration
• gui metainfo/archive
• api basics
• api examples
• python library
• aitoolkit (at least a reference) and north (if v1.1?)
• dev getting started
• dev metainfo
• dev parser
• dev normalizer
• oasis