Rework fixers to decide what to use and move dehtmlify process in them.

Added githubv fixer.

rss/parse.go

@@ -7,7 +7,6 @@ import (
 	"time"
 
 	"github.com/mmcdole/gofeed"
-	"github.com/prodigeris/html2text"
 	"go.dev.pztrn.name/rsser/fixers"
 )
 
@@ -61,14 +60,7 @@ func (r *RSS) Parse() {
 				continue
 			}
 
-			description, err := html2text.FromString(item.Description, html2text.Options{
-				PrettyTables: true,
-			})
-			if err != nil {
-				description = item.Description
-			}
-
-			title, fixedDescription := fixers.Fix(feedURL.Host, item.Title, description)
+			title, fixedDescription := fixers.Fix(feedURL.Host, item)
 
 			for _, output := range r.outputs {
 				if feed.Output == output.Name() {