xmark-starter blocklet is really cool but it need tidy up and some small bugfixes

[mave99a]

xmark-starter blocklet is really cool but it need tidy up and some small bugfixes.

I think we should first treat it as a product, so every demo pages are carefully planned. We should only include very few pages as example, leave most on our document site (since updating those documents takes time, we don't want old document copied over and over with those blocklets)

• [ ] the home page should clearly tell it's a demo starter site, and it should contain links to our sites, document sites etc.
• [ ] ideally we use left panel (like the document site) to allow users quickly switch from different demo pages
• [ ] ensure all demo pages are well organized, not leaking our unreleased products (e.g. DID:Connect page is in one of the demo page)

[mave99a]

Ideally @echoecho-arcblock and @robroyhobbs, @jonathanlu813 can handle it without the help from dev team.

I added @jonathanlu813 because you need to think about those belongs to "product design", to make something like a "product". The current status is excellent example, from engineering point of view, it's nearly done, but from product point of view, it's not.

It's purely a product release of xmark powered pages.