dead link in guides/tools.html

[SelvinPL]

there is a dead link in https://gbdev.io/guides/tools.html#if-you-don-t-know-asm-c-or-c

online IDE point to https://daid.github.io/rgbds-live/ not https://gbdev.io/rgbds-live/

[ISSOtm]

Fixed in 157a9aa