Public-facing user home page redesign

When you click on someone's webid, wherever you click on a link to them in the solid world, they will want you to see a profile display which does them credit and represents them well on the web. This is quite different from the private home screen which is covered in https://github.com/solid/node-solid-server/issues/889.
What sort of things?

• Photo(s)

• Customizable style, color, etc, background images, etc

• Contact details which are public.

• Statement like twitter profile

• Timeline of public things posts, etc

Optionally a selection of:

• Professional role, status, CVS a la linked in
• My public folder
• My public photos, music, video clips.
• Publications, blogs, papers,
• List of my public social graph (friends list)
• etc

but also things which as a viewer

Interact to me:

• Message me
• mail me
• Invite me to things.

If viewer not logged on, allow to log on.

If viewer logged on, possibly give more things, but pulling data from ACL's files like a friends-only timeline, indexes, etc.

首先查看 issue 889，以便将私有主页与这个面向公众的个人资料分开。该 issue 列出了许多可选的个人资料、社交、媒体和互动功能，但没有指定任何文件或测试；在可以认为实现已完成之前，需要先就范围和验收标准达成一致。