spectrafit

48b99e0a - docs: :memo: docs: Update `SpectraFit` documentation link and add badge

docs: :memo: docs: Update `SpectraFit` documentation link and add badge Update the documentation link for `SpectraFit` to point to the extended documentation page. Also, add a badge for the Material for MkDocs library which is used to generate the documentation. Fixes docs: Adding a mkdocs-material badge to SpectraFit #1463