guides: add redirect from old title of "Choosing tools" (#82)

* add redirect from old title of "Choosing tools"

The article used to be called "To C or not to C" before anti-SDCC
snark was toned down.  Repair inbound links to the old title with
this signpost.

Because GitHub Pages doesn't appear to support HTTP redirects
(status 301 Moved Permanently), attempt to use meta refresh as
a substitute.

* add redirect notice

---------

Co-authored-by: Antonio Vivace <avivace4@gmail.com>

Author: pinobatch

website/to_c_or_not_to_c.md

@@ -0,0 +1,20 @@
+---
+sidebar: false
+head:
+  - - meta
+    - http-equiv: refresh
+      content: 10; url=https://gbdev.io/guides/tools.html
+  - - link
+    - rel: canonical
+      href: https://gbdev.io/guides/tools.html
+---
+
+# To C or not to C
+
+This guide has been moved to
+"[Choosing tools for Game Boy development](guides/tools.html)".
+
+Please update your bookmarks and ask other website operators
+to update inbound links.
+
+In 10 seconds, you'll be redirected.