feat: update to go modules

vendor/github.com/alecthomas/chroma/styles/bw.go

@@ -1,30 +0,0 @@
-package styles
-
-import (
-	"github.com/alecthomas/chroma"
-)
-
-// BlackWhite style.
-var BlackWhite = Register(chroma.MustNewStyle("bw", chroma.StyleEntries{
-	chroma.Comment:               "italic",
-	chroma.CommentPreproc:        "noitalic",
-	chroma.Keyword:               "bold",
-	chroma.KeywordPseudo:         "nobold",
-	chroma.KeywordType:           "nobold",
-	chroma.OperatorWord:          "bold",
-	chroma.NameClass:             "bold",
-	chroma.NameNamespace:         "bold",
-	chroma.NameException:         "bold",
-	chroma.NameEntity:            "bold",
-	chroma.NameTag:               "bold",
-	chroma.LiteralString:         "italic",
-	chroma.LiteralStringInterpol: "bold",
-	chroma.LiteralStringEscape:   "bold",
-	chroma.GenericHeading:        "bold",
-	chroma.GenericSubheading:     "bold",
-	chroma.GenericEmph:           "italic",
-	chroma.GenericStrong:         "bold",
-	chroma.GenericPrompt:         "bold",
-	chroma.Error:                 "border:#FF0000",
-	chroma.Background:            " bg:#ffffff",
-}))