Add kitty 256color palette

This was generated by this very ugly command:

$ curl -Ls https://raw.githubusercontent.com/kovidgoyal/kitty/6e351cd945bba0a3d6eef92e4605f760ee98e077/kitty/options/definition.py | grep -Po "color[0-9]+', '#[0-9a-z]+'" | awk -F, '{printf("%s=%s\n", $1, $2)}' | sed "s/'//g" | sed "s/ //" | sed "s/#//"

themes/kitty

@@ -4,19 +4,260 @@ color=111111 cccccc
 [colors]
 foreground=dddddd
 background=000000
-regular0=000000  # black
-regular1=cc0403  # red
-regular2=19cb00  # green
-regular3=cecb00  # yellow
-regular4=0d73cc  # blue
-regular5=cb1ed1  # magenta
-regular6=0dcdcd  # cyan
-regular7=dddddd  # white
-bright0=767676   # bright black
-bright1=f2201f   # bright red
-bright2=23fd00   # bright green
-bright3=fffd00   # bright yellow
-bright4=1a8fff   # bright blue
-bright5=fd28ff   # bright magenta
-bright6=14ffff   # bright cyan
-bright7=ffffff   # bright white
+
+0=000000
+8=767676
+1=cc0403
+9=f2201f
+2=19cb00
+10=23fd00
+3=cecb00
+11=fffd00
+4=0d73cc
+12=1a8fff
+5=cb1ed1
+13=fd28ff
+6=0dcdcd
+14=14ffff
+7=dddddd
+15=ffffff
+16=000000
+17=00005f
+18=000087
+19=0000af
+20=0000d7
+21=0000ff
+22=005f00
+23=005f5f
+24=005f87
+25=005faf
+26=005fd7
+27=005fff
+28=008700
+29=00875f
+30=008787
+31=0087af
+32=0087d7
+33=0087ff
+34=00af00
+35=00af5f
+36=00af87
+37=00afaf
+38=00afd7
+39=00afff
+40=00d700
+41=00d75f
+42=00d787
+43=00d7af
+44=00d7d7
+45=00d7ff
+46=00ff00
+47=00ff5f
+48=00ff87
+49=00ffaf
+50=00ffd7
+51=00ffff
+52=5f0000
+53=5f005f
+54=5f0087
+55=5f00af
+56=5f00d7
+57=5f00ff
+58=5f5f00
+59=5f5f5f
+60=5f5f87
+61=5f5faf
+62=5f5fd7
+63=5f5fff
+64=5f8700
+65=5f875f
+66=5f8787
+67=5f87af
+68=5f87d7
+69=5f87ff
+70=5faf00
+71=5faf5f
+72=5faf87
+73=5fafaf
+74=5fafd7
+75=5fafff
+76=5fd700
+77=5fd75f
+78=5fd787
+79=5fd7af
+80=5fd7d7
+81=5fd7ff
+82=5fff00
+83=5fff5f
+84=5fff87
+85=5fffaf
+86=5fffd7
+87=5fffff
+88=870000
+89=87005f
+90=870087
+91=8700af
+92=8700d7
+93=8700ff
+94=875f00
+95=875f5f
+96=875f87
+97=875faf
+98=875fd7
+99=875fff
+100=878700
+101=87875f
+102=878787
+103=8787af
+104=8787d7
+105=8787ff
+106=87af00
+107=87af5f
+108=87af87
+109=87afaf
+110=87afd7
+111=87afff
+112=87d700
+113=87d75f
+114=87d787
+115=87d7af
+116=87d7d7
+117=87d7ff
+118=87ff00
+119=87ff5f
+120=87ff87
+121=87ffaf
+122=87ffd7
+123=87ffff
+124=af0000
+125=af005f
+126=af0087
+127=af00af
+128=af00d7
+129=af00ff
+130=af5f00
+131=af5f5f
+132=af5f87
+133=af5faf
+134=af5fd7
+135=af5fff
+136=af8700
+137=af875f
+138=af8787
+139=af87af
+140=af87d7
+141=af87ff
+142=afaf00
+143=afaf5f
+144=afaf87
+145=afafaf
+146=afafd7
+147=afafff
+148=afd700
+149=afd75f
+150=afd787
+151=afd7af
+152=afd7d7
+153=afd7ff
+154=afff00
+155=afff5f
+156=afff87
+157=afffaf
+158=afffd7
+159=afffff
+160=d70000
+161=d7005f
+162=d70087
+163=d700af
+164=d700d7
+165=d700ff
+166=d75f00
+167=d75f5f
+168=d75f87
+169=d75faf
+170=d75fd7
+171=d75fff
+172=d78700
+173=d7875f
+174=d78787
+175=d787af
+176=d787d7
+177=d787ff
+178=d7af00
+179=d7af5f
+180=d7af87
+181=d7afaf
+182=d7afd7
+183=d7afff
+184=d7d700
+185=d7d75f
+186=d7d787
+187=d7d7af
+188=d7d7d7
+189=d7d7ff
+190=d7ff00
+191=d7ff5f
+192=d7ff87
+193=d7ffaf
+194=d7ffd7
+195=d7ffff
+196=ff0000
+197=ff005f
+198=ff0087
+199=ff00af
+200=ff00d7
+201=ff00ff
+202=ff5f00
+203=ff5f5f
+204=ff5f87
+205=ff5faf
+206=ff5fd7
+207=ff5fff
+208=ff8700
+209=ff875f
+210=ff8787
+211=ff87af
+212=ff87d7
+213=ff87ff
+214=ffaf00
+215=ffaf5f
+216=ffaf87
+217=ffafaf
+218=ffafd7
+219=ffafff
+220=ffd700
+221=ffd75f
+222=ffd787
+223=ffd7af
+224=ffd7d7
+225=ffd7ff
+226=ffff00
+227=ffff5f
+228=ffff87
+229=ffffaf
+230=ffffd7
+231=ffffff
+232=080808
+233=121212
+234=1c1c1c
+235=262626
+236=303030
+237=3a3a3a
+238=444444
+239=4e4e4e
+240=585858
+241=626262
+242=6c6c6c
+243=767676
+244=808080
+245=8a8a8a
+246=949494
+247=9e9e9e
+248=a8a8a8
+249=b2b2b2
+250=bcbcbc
+251=c6c6c6
+252=d0d0d0
+253=dadada
+254=e4e4e4
+255=eeeeee