doc: Reformat reStructuredText to Markdown

Includes !46 (merged)

doc/design_goals.md

-.. Copyright 2020 Collabora, Ltd.
+---
+SPDX-FileCopyrightText: 2020 Collabora, Ltd.
+SPDX-License-Identifier: MIT
+---
 
-Wayland Color Management and HDR Design Goals
-=============================================
+[Front page](../README.md)
+
+
+# Wayland Color Management and HDR Design Goals
 
 The goals of Wayland color management and *high dynamic range* (HDR) support
 protocol extension are:
@@ -30,7 +35,7 @@ and get at least the level of color managed presentation features they received
 on Xorg. It is possible that this requires e.g. re-creating monitor color profiles,
 recalibration, or other reconfiguring.
 
-The use of ``xrandr`` and similar X11 tools and interfaces are intentionally
+The use of `xrandr` and similar X11 tools and interfaces are intentionally
 not supported as the Wayland desktop paradigm does not allow clients to force
 effects on other clients. Those global properties, including video mode
 and display color depth, are left to each Wayland compositor's own settings