feat: added general software notes link
Gradus.jl information
Link to data archive
Added NuSTAR info
Updated X-ray data analysis description
Updated Julia (markdown)
Updated Mac (markdown)
Placeholder for now
Split disc modelling into spectra and timing
Updated Modelling relativistic discs (markdown)
grppha notes
Updated format for XSPEC walk through
XSPEC and SpectralFitting.jl notes added
XMM SAS link
Updated X-ray analysis description
Matrix Element instructions
Minor reformatting of Mac notes
Some Mac set up information
Updated Home (markdown)
XMM ABC guide link
Started writing the relativistic discs section
Updated Relativistic accretion discs (markdown)
XQuartz settings to allow connections from network clients
Changed /mydata to /data
Added more instructions about accessing your data in the container
Updated Docker (markdown)