Update README for new version

Author: randomnetcat

README.md

@@ -2,14 +2,7 @@
 
 This repository contains code to generate a flowchart showing the initialization rules for C++20.
 
-The generated files are hosted on Github Pages: [SVG](https://randomnetcat.github.io/cpp_initialization/initialization.svg), [PNG](https://randomnetcat.github.io/cpp_initialization/initialization.png).
+The generated files are hosted on Github Pages:
+* C++20: [SVG](https://randomcat.org/cpp-initialization/std-2020/initialization.svg), [PNG](https://randomcat.org/cpp-initialization/std-2020/initialization.png).
+* C++23: [SVG](https://randomcat.org/cpp-initialization/std-2023/initialization.svg), [PNG](https://randomcat.org/cpp-initialization/std-2023/initialization.png).
 
-## Building
-
-The repository contains an M4 file which can be preprocessed into a graphviz dot file using GNU M4. Feed the preprocessed file into dot to get an image file.
-
-Example for SVG: `m4 flowchart.dot.m4 | dot -Tsvg > flowchart.svg`
-
-Example for PNG: `m4 flowchart.dot.m4 | dot -Tpng > flowchart.png`
-
-Consult the `dot` manual for all of the file types and other options for controlling `dot`.