- new: show image inside content
- new: update the parser to use the first media content
       if the primary content is missing (youtube feeds)

- fix: loading items (by scrolling down) is glitching while feeds are refreshing

- fix: scrollTo/scrollBy with smooth behavior instead of scrollTop

- ref: drop goquery, switch to cascadia (or `x/net`)
- ref: `mmcdole/gofeed` has too many indirect deps, drop it

- ref: convert `.content` to `#content`