updates for summonerd webapp

[redshiftzero]

Closes #3220

This splits the web app into three pages.

Main page

This currently displays the current phase, where the current phase info is determined by looking in the database to see if the transition between phase 1 and 2 has occurred.

It also contains instructions for this phase, where the --phase CLI arg is populated using the information determined as above.

Remaining TODOs:

• [-] Populate the text on the page with the COORDINATOR_URL and SUMMONER_ADDRESS - no longer needed as we will hardcode these in pcli to simplify the user's experience

/phase/1 and /phase/2 pages

These are identical pages, one per phase, that show the:

• The number of contributions in that phase
• The most recent 5 contributions: short address, hash, time of contribution completed

Remaining TODOs:

• Show most recent bid amount
• If phase is currently active, show the number of folks connected

[cronokirby]

Instead of populating the text on page, we should simply make pcli have default arguments for these two in the code.

[cronokirby]

Also, I don't see why we wouldn't just display all the contributions; thousands shouldn't be an issue.