feat: Merge categories/tags and improve filtering (#541)

* Experiment with SSR and query params

* Require all tags to be present

* Fix when no query param present

* Add tag links

* Working add/remove tags

* Fix templates route

* Remove old category/tags selectors

* Button style

* More styling

* Remove unused code

* Remove @sindresorhus/slugify

* Format and disable prerender

* Improve css grid

* Use searchParams.getAll

* Replace itemsjs with filter/sort functions

* Always show selected tags

* Add data-sveltekit-noscroll

* Move sortableFields to prop level

* Simplify code

* Fix sortArray for dates

* Add an icon to clear filters

* Convert tags to kebab-case

* Add category to tags

* Delete category field

* Remove duplicated tags

* Merge more tags

src/lib/utils/arrayUtils.ts

@@ -0,0 +1,34 @@
+import dayjs from 'dayjs';
+
+export const filterArray = <T>(arr: T[], filter: string): T[] => {
+	if (!filter) {
+		return arr;
+	}
+	// cast to string and lowercase to have non-dependant type and case search
+	filter = String(filter).toLowerCase();
+	return arr.filter((object) =>
+		// get only values from iterated objects
+		Object.values(object).some((objValue) => {
+			// casting field values to the same shape
+			return String(objValue).toLowerCase().includes(filter);
+		})
+	);
+};
+
+export const sortArray = <T>(arr: T[], filter: { value: string; asc: boolean }): T[] => {
+	return arr.toSorted((a, b) => {
+		if (filter.asc) {
+			if (filter.value === 'date') {
+				return dayjs(a[filter.value]) > dayjs(b[filter.value]) ? 1 : -1;
+			} else {
+				return a[filter.value] > b[filter.value] ? 1 : -1;
+			}
+		} else {
+			if (filter.value === 'date') {
+				return dayjs(a[filter.value]) < dayjs(b[filter.value]) ? 1 : -1;
+			} else {
+				return a[filter.value] < b[filter.value] ? 1 : -1;
+			}
+		}
+	});
+};