SDL: docs: Remove README-hg.md

From 42579e2af16ec818b3c5580e2cec7256f421deb8 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Tue, 23 Apr 2024 15:48:29 -0400
Subject: [PATCH] docs: Remove README-hg.md

It's been a few years in general, and SDL3 has never been in Mercurial.

We'll leave this document alive in the SDL2 branch, though!
---
 docs/README-hg.md | 7 -------
 1 file changed, 7 deletions(-)
 delete mode 100644 docs/README-hg.md

diff --git a/docs/README-hg.md b/docs/README-hg.md
deleted file mode 100644
index b42aaa5b2ccae..0000000000000
--- a/docs/README-hg.md
+++ /dev/null
@@ -1,7 +0,0 @@
-Mercurial
-======
-
-We are no longer hosted in Mercurial. Please see README-git.md for details.
-
-Thanks!
-