Replaced or extended all default references to zathura with
sioyek so it will automatically take on any tasks meant
for pdf reading. With the current configuration, hardly a
change should be noticed.
Mimicking my move from master branches to main,
now my overall general library also resides in 'main'
instead of 'master'.
No real visible change, but unifies the wording for
everything.
Moved my old study library to the more descriptive emgs library
to differentiate from newly added studies under the academia
library.
Both can still be accessed through the main library.
