Node health indicator on liquidity page

[rolznz]

Link to an Alby guide with suggestions to increase node resiliency and payment reliability

Factors:

• Number of unique channel partners with active channels. 1 = bad, 2 = good, 3+ = great
• Summed channel balance - completely balanced = great, one sided = bad
• Average? Channel size - < 1M sats = bad, > 1M sats = good
• Percent of channels within 20-80% capacity (therefore, hopefully usable for both sending and receiving)

[MoritzKa]

I think it is a great start and we should be very transparent about it (e.g. linking to a detailed guide outside of the app). So users can get actionably insights and can even suggest changes to the score. One important factor for payment success is liquidity along the route. So I thought about including the factor of "Channel Peer quality" according to some ranking (e.g. Lightning Terminal). But that's a very fuzzy approximisation. So I'd leave that out for now.