feat: port 10 sources from diverse bases

Passing (9): deathtollscans (FoolSlide), mangatellers (FoolSlide),
  eighteenporncomic (Manga18), manga18club (Manga18),
  manhuaplusorg (Liliana), manhwahub (ManhwaZ),
  noxenscans (MangaThemesia), skymanga (MangaThemesia),
  mangatx (MangaThemesia)
Site issue (1): luascans (HeanCms) — Cloudflare banned

sources/en/mangatx/mangatx.go

@@ -0,0 +1,16 @@
+package mangatx
+
+import (
+	"goyomi/internal/registry"
+	base "goyomi/sources/base/mangathemesia"
+)
+
+func New() *base.Source {
+	return base.New(base.Config{
+		Name:    "MangaTX",
+		BaseURL: "https://mangatx.cc",
+		Lang:    "en",
+	})
+}
+
+func init() { registry.Register(New()) }