refactor(Dashboard): fix Proof count. Cleanup Price & Proof headers

[raphodn]

What

User Prices

• move Dashboard link down
• remove Share button

User proofs

• fix count
• move Dashboard link down

[raphodn]

@serpico possibly fixes another bug on the proof count that was displayed

[serpico]

@raphodn how much work would it take to add order like :

• proof with the greater number of prices first/at the top vs oldest first/at the top
• oldest date first/at the top vs newest date first/at the top

although I could totally wait for the more versatile/powerful search feature #839

[raphodn]

ordering is easy :)
can you copy-paste your message in #839 ?
I renamed the issue to include ordering as well !

but filtering is a bit harder
will need to revamp the current mecanism (how it works right now is not scalable, realized this in #904)