Fix CSS and switch to local copy of simple.cssHEADmain

Somehow this stopped working. Handling this with a local copy instead of
a Git submodule is anyway easier. Thus this commit fixes it with a
switch to a local copy.

1 files changed, 1 insertions, 0 deletions

diff --git a/simple.css/README.md b/simple.css/README.md
new file mode 100644
index 0000000..1981666
--- /dev/null
+++ b/simple.css/README.md
@@ -0,0 +1 @@
+This folder contains a local copy of `simple.css` from the [simple.css project](https://simplecss.org/).