Update smol-slime.md (#331)

general changes to some wording and layout, rename and add some sections for clarity; additional changes listed

mention nrf54L soc

add descriptions for receiver selection

rewrite dongle description, remove mentions of modifying receiver antenna

make it clear that ebyte dongle is available at aliexpress or alibaba

remove unnecessary detail in BT5040U vs BT5040UA

note that nordic dongle is official dev hardware

explain microcontroller antennas are not optimized and consolidate using same boards as receivers

move antenna modification to supermini only, and explain what it is

add possible search descriptions for supermini

add where to get XIAO board

add basic parts description to tracker

remove bmi warning

consolidate Not Tested notices

rewrite IMU Modules sections

do not describe the imus and drift for imu modules, this should be done from IMU Comparison

describe actually what happens with button configurations

describe when a switch should be used

add a table for battery selection

specify SuperMini for schematics

remove button methods on receiver

remove unnecessary receiver Pair step on firmware update

clarify led blinks

put HID protocol under details

remove slightly condescending wording about making issues

use correct names from firmware

use correct name and author for hardware

remove redundant community labels