[web] Fixed (or removed) prj file references.

web/archetypes/benchmark.md

...chmarks/bgr_verification_examples/heatconduction/index.md

...chmarks/bgr_verification_examples/hydromechanics/index.md

...benchmarks/bgr_verification_examples/liquid_flow/index.md

...s/benchmarks/bgr_verification_examples/mechanics/index.md

...s/bgr_verification_examples/thermohydromechanics/index.md

...hmarks/bgr_verification_examples/thermomechanics/index.md

...creep-after-excavation-bgra/CreepAfterExcavation/index.md

...cs/benchmarks/creepbgra/BGRaVerificationExamples/index.md

web/content/docs/benchmarks/creepbgra/CreepBGRa/index.md

...tent/docs/benchmarks/elliptic/drainage_diffusion/index.md

...liptic/elliptic-dirichlet-volumetric-source-term/index.md

...tent/docs/benchmarks/elliptic/elliptic-dirichlet/index.md

...ontent/docs/benchmarks/elliptic/elliptic-neumann/index.md

...lliptic-pde-with-dirichlet-and-nodal-source-term/index.md

web/content/docs/benchmarks/elliptic/elliptic-robin/index.md

...ontent/docs/benchmarks/elliptic/poisson_equation/index.md

...ent/docs/benchmarks/heat-transport-bhe/3D_2U_BHE/index.md

...ocs/benchmarks/heat-transport-bhe/3D_3BHEs_array/index.md

...enchmarks/heat-transport-bhe/3D_BHE_GW_advection/index.md