extend the assembly instructions

[jerabaul29]

extend the assembly instructions for the long term deployment buoy:

• START by testing the thermistor string
• buoy model
• how to set up the "holding rope" + shackle
• how to put the thermistor string penetrator
• connectors used for power
• connectors used for thermistor string: tricks and tips, GND vs others, how to assemble, etc
• bluerobotics enclosure and tricks and tips
• battery pack assembly tricks and tips