Use glamour and termev to render/colorize content (#181)

Merge branch 'master' into use-glamour

select Glamour Theme based on BackgroundColor

Merge branch 'master' into use-glamour

Merge branch 'master' into use-glamour

update termev

update go.mod

label color colorate

use glamour for issue content

Vendor: Add glamour

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/181
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>

cmd/config.go

@@ -21,6 +21,7 @@ import (
 	"code.gitea.io/tea/modules/git"
 	"code.gitea.io/tea/modules/utils"
 
+	"github.com/muesli/termenv"
 	"gopkg.in/yaml.v2"
 )
 
@@ -100,6 +101,13 @@ func init() {
 	yamlConfigPath = filepath.Join(dir, "tea.yml")
 }
 
+func getGlamourTheme() string {
+	if termenv.HasDarkBackground() {
+		return "dark"
+	}
+	return "light"
+}
+
 func getOwnerAndRepo(repoPath, user string) (string, string) {
 	if len(repoPath) == 0 {
 		return "", ""