Restore ESLint and Prettier auto-formatting and CI linting (#1457)

* Restore ESLint and Prettier autoformatting

* Fix formatting and lints in web files

* Hacky fix to eslint crash

* Fix remaining lints

* Add lint-fix script

---------

Co-authored-by: 0hypercube <0hypercube@gmail.com>

.prettierrc

@@ -3,6 +3,7 @@
 	"useTabs": true,
 	"tabWidth": 4,
 	"printWidth": 200,
+	"plugins": ["prettier-plugin-svelte"],
 	"overrides": [
 		{
 			"files": ["*.yml", "*.yaml"],
@@ -10,6 +11,12 @@
 				"useTabs": false,
 				"tabWidth": 2
 			}
+		},
+		{
+			"files": ["*.svelte"],
+			"options": {
+				"parser": "svelte"
+			}
 		}
 	]
 }