Add a sphinx gallery to the homepage
A 3*2 gallery with:
- Dipacus' life-cycle
- Dipsacus' stochastic trajectory (not doable now, I'll be working on it)
- Dipsacus' eigenvalues
- Dipsacus' stacked deterministic trajectory
- Dipsacus' transient oscillations
- The genealogy of a realization of Dipsacus' IBM (not doable now)
Long live Dipsacus sylvestris.