appview/pages/markup: drop math support for markdown

Rendering specific LaTeX expression results infinite loop on renderer,
causing entire appview to crash

Signed-off-by: Seongmin Lee <[e-mail]>

appview/pages/markup/markdown.go

···
 
 	chromahtml "github.com/alecthomas/chroma/v2/formatters/html"
 	"github.com/alecthomas/chroma/v2/styles"
-	treeblood "github.com/wyatt915/goldmark-treeblood"
 	"github.com/yuin/goldmark"
 	highlighting "github.com/yuin/goldmark-highlighting/v2"
 	"github.com/yuin/goldmark/ast"
···
 			extension.NewFootnote(
 				extension.WithFootnoteIDPrefix([]byte("footnote")),
 			),
-			treeblood.MathML(),
 			callout.CalloutExtention,
 			textension.AtExt,
 		),