simplify some explanations
rename AICG* -> Gaussian
rename cube to cuboid
add index
add a description of each table in the input file
small changes
shorten some lines
fix link position
add an explanations about TOML format to tutorial
Updated Design (markdown)
Updated Developers Guide (markdown)
Updated Home (EN) (markdown)
Updated Mjolnir Design (EN) (markdown)
Updated Home (markdown)
Updated _Sidebar (markdown)
add design overview