Reorganize documentation to present Risch as one method choice#7

ChrisRackauckas merged 2 commits intoJuliaSymbolics:mainJuliaSymbolics/SymbolicIntegration.jl:mainfrom

ChrisRackauckas-Claude:reorganize-docs-methodsChrisRackauckas-Claude/SymbolicIntegration.jl-1:reorganize-docs-methodsCopy head branch name to clipboard