Remove 3D/WebGL context command line instruction

Remove outdated instruction regarding 3D/WebGL context usage.

Author: pmp-p

wiki/pygbag/README.md

@@ -169,7 +169,7 @@ If using pygame-zero (mostly untested), put `#!pgzrun` near the top of main.py.
 /dist
 ```
 ### Using 3D/WebGL context ?
-Add `--template noctx.tmpl` to pygbag command line if using 3D/WebGL ( eg Panda3D / Harfang / raylib ) or pygame.sdl2 renderer.
+~~Add `--template noctx.tmpl` to pygbag command line if using 3D/WebGL ( eg Panda3D / Harfang / raylib ) or pygame.sdl2 renderer.~~
 nb: a context is either 2D (pygame) or 3D(pygame.sdl2/3D engines) you cannot switch after the mode is inited.
 but you can use pygame 2D inside a 3D engine at the cost of surface to gpu texture conversion+uploading.