Fix mining section

[roarde]

It can't really wait for a revamp of the site.

[roarde]

A couple of places to discover pools:

• Mining Pool Stats. Type "xmy" in the search box, go through the algos.
• Myriadcoin Miners. Identified pools are documented in PHP Coinbase Miners.

[roarde]

The layout of this section is a legacy from previous major revisions of the site. Time to start this section fresh.

#170
List P2P section:

• myr-groestl -> nz.nutty.one
• yescrypt -> yescrypt.easymine.online
• argon2d -> p2p-spb.xyz

Other pools section:

• sha256d -> mininfield
• myr-groestl -> miningpoolhub
• yescrypt -> mininpoolhub, myriadcoin.tk, pokemongomongo.tk
• argon2d -> pokemongomongo.tk

Merge mining pools section (for this section I put the URL from the pool and added at the beginning the algo supported for myriadcoin):

• zergpool
• zpool
• block masters
• ahashpool
• mining-dutch

Let me know If I miss some of them or you want to remove. I will try to do a renewal of this section from the layout to make it more friendly.

Cheers

[cryptapus]

@carlRondoni Thanks for the contrib, looks good to me.