Remove waffle.io references

The site has shut down.

Signed-off-by: Nicolas Bock <[email protected]>

Author: nicolasbock

README.md

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 [![Build Status](https://travis-ci.org/lanl/qmd-progress.svg?branch=master)](https://travis-ci.org/lanl/qmd-progress)
-[![Waffle.io - Columns and their card count](https://badge.waffle.io/lanl/qmd-progress.svg?columns=all)](https://waffle.io/lanl/qmd-progress)
 [![codecov](https://codecov.io/gh/lanl/qmd-progress/branch/master/graph/badge.svg)](https://codecov.io/gh/lanl/qmd-progress)
+
 # A library for quantum chemistry solvers.
 
 PROGRESS: Parallel, Rapid _O(N)_ and Graph-based Recursive Electronic

docs/index.md

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 the PROGRESS library. LA-UR number 'LA-UR-17-27372'
 
 [![Build Status](https://travis-ci.org/lanl/qmd-progress.svg?branch=master)](https://travis-ci.org/lanl/qmd-progress)
-[![Waffle.io - Columns and their card count](https://badge.waffle.io/lanl/qmd-progress.svg?columns=all)](https://waffle.io/lanl/qmd-progress)
 
 # A library for quantum chemistry solvers.