[web] Disabled visualizations.

...nt/docs/benchmarks/elliptic/groundwater-flow-dirichlet.md

...tent/docs/benchmarks/elliptic/groundwater-flow-neumann.md

.../benchmarks/elliptic/square_1e2_pcs_0_ts_1_t_1.000000.png

...ntent/docs/benchmarks/hydro-thermal/constant-viscosity.md

...all-deformations/disc_with_hole_pcs_0_ts_4_t_1.000000.png

...rks/small-deformations/mechanics-linear-disc-with-hole.md