Update and rename Readme.typ to _Readme.typ

Renamed to `_Readme.typ` to not confuse the GitHub "readme" directory reader.

Author: joz-k

doc/Readme.typ doc/_Readme.typdoc/Readme.typ renamed to doc/_Readme.typ

@@ -1,5 +1,5 @@
 // Create `Readme.pdf` using following command:
-// typst compile Readme.typ Readme.pdf
+// typst compile _Readme.typ Readme.pdf
 
 #import "@preview/note-me:0.4.0": *