2025.2

What's Changed

• petsctools.init returns petsc4py.PETSc by @JHopeCollins in #15
• Add petsctools website by @connorjward in #17
• Add citations management functions by @connorjward in #14
• Ensure that PETSc initialisation is lazy by @connorjward in #18

Full Changelog: v2025.1...2025.2