add light colors, use 38;5;N instead of 3N, styled and colored buttons

[mekb-turtle]

added light colors as not all terminal emulators will make bold colors light (such as kitty)

to use light colors without bold you'd need to use 38;5;N instead of 1;3N

i would've kept the dark colors as 3N but if select bold, some terminal emulators will make it light, however 38;5;N won't go light

i've also made the italic/bold/underline/strikethrough buttons have their style, and the colored buttons have their color as an outline

[mekb-turtle]

if you want to remove the colors/style on the buttons, just delete from line 91 to the end in main.css