Rationalize head block card

We must find a better way to present data in head block card. Right now it's just the list of properties without bigger prioritization. I believe good ideas from Account page should be implemented here.

My proposition is to divide it like that:

1. On main card, always open, put:

• Block number with link
• Operations in that block (change that stupid "per block" name, it's not about every block but this one)
• Witness (with avatar and link)
• Feed price
• Blockchain time

2. Then go with "Supply and Funds" card:

• Everything we have right now from Rewards fund to Total vesting fund hive

3. "Hive parameters":

• Everything from the rest except the dates

4. "Times":

• Next maintenance time, Last budget time and Next daily maintenance time

Also please fix one missing percent in Hbd stop percent (use the same utils as the rest) and localize times. Everything except the main card should be expendable and hidden by default.