Improve Showcase page to only show external apps + better template to use as you go

[qchuchu]

• Currently our showcase only show our examples -> It should better show the apps that have been built by Skybridge
• We should have highly curated templates of apps that people can use directly

[udaykakade25]

Hey,
As of present, Showcase section shows both examples as well as 3rd Party apps.
Should i change the order and bring 3rd Party apps at the top (we have just 6 apps built by Skybridge)