fix: Support description markdown and longer length (#385)

Fixes https://github.com/webrecorder/replayweb.page/issues/381

## Changes

- Renders description as markdown
- Shows "Collection name" and "About this collection" labels when
description is present
- Fixes overflow issue where bottom few pixels of embed is cut off
- Hides description in mobile view

Co-authored-by: emma <hi@emma.cafe>

src/index.ts

@@ -13,6 +13,7 @@ import { Sorter } from "./sorter";
 import { SWManager } from "./swmanager";
 import { URLResources } from "./url-resources";
 import { Embed } from "./embed";
+import "./coll-description";
 import "./shoelace";
 
 export {