Improve install instructions
Improve install instructions

Make the default install method stand out more than other options. Include a large link.

webtorrent/webtorrent-desktop,michaelgeorgeattard/webtorrent-desktop,feross/webtorrent-app,feross/webtorrent-desktop,feross/webtorrent-desktop,webtorrent/webtorrent-desktop,michaelgeorgeattard/webtorrent-desktop,michaelgeorgeattard/webtorrent-desktop,feross/webtorrent-desktop,feross/webtorrent-app,webtorrent/webtorrent-desktop,feross/webtorrent-app