fix: page table figure should be displayd as grid

LIIKUNTA-771.

1. Fix page content to overflow with too wide table.
2. Fix table figure element to be displayed as grid, to get it
scrollable on small screens.

Author: nikomakela

src/core/pageContent/pageMainContent.module.scss

@@ -12,6 +12,7 @@
 .mainContent {
   figure {
     margin: 0;
+    display: grid;
     img {
       height: auto;
     }