Update Readme

README.md

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 # MATH-251(b): Numerical analysis
+[![](https://img.shields.io/badge/website-static-blue.svg)](https://teaching.matmat.org/numerical-analysis)
 
-This repository will be the future location
-of the teaching material of the course
-[**MATH-251(b) numerical analysis**](https://edu.epfl.ch/coursebook/en/numerical-analysis-MATH-251-B)
-at EPFL. For more details
-see [matmat.org/teaching](https://matmat.org/teaching/#numerical_analysis).
-
-At the moment most course material is still internal
-and can be accessed at
-[go.epfl.ch/numerical-analysis](https://go.epfl.ch/numerical-analysis).
+This repository contains the teaching material of the course
+[**MATH-251(b) numerical analysis**](https://edu.epfl.ch/coursebook/en/numerical-analysis-MATH-251-B) at EPFL.
+For a static version of this website and more details about the course
+see <https://teaching.matmat.org/numerical-analysis>.