[FEATURE REQ] Remove BExplorer Put Mempool

[hellresistor]

What & why

I suggest remove BExplorer, and Replace by Mempool.

I can tell you with own experience. BExplorer explode with raspberry resources. With Mempool its so better, almost no resource consumption (CPU&RAM).

Not a bad idea, may just adapt something from here: https://raspibolt.org/guide/bonus/bitcoin/mempool.html