add markdown-grid-tables and document extension usage

config.json

@@ -16,7 +16,8 @@
 	},
 	"MARKDOWN_EXTENSIONS": [
 		"extra", "incorporealcms.mdx.figures", "incorporealcms.mdx.pydot",
-		"sane_lists", "smarty", "toc", "attr_list", "tables", "pymdownx.tilde", "md_in_html"
+		"sane_lists", "smarty", "toc", "attr_list", "tables", "pymdownx.tilde", "md_in_html",
+		"markdown_grid_tables"
 	],
 	"MARKDOWN_EXTENSION_CONFIGS": {
 		"extra": {
@@ -24,6 +25,9 @@
 				"UNIQUE_IDS": true
 			}
 		},
+		"markdown_grid_tables": {
+			"hard_linebreaks": false
+		},
 		"toc": {
 			"toc_depth": "2-5"
 		}

extensions.txt

@@ -0,0 +1,4 @@
+Necessary extensions to render this site:
+
+pymdown-extensions
+markdown-grid-tables