Remove line break so badges line up (#406)

Author: brian-rose

README.md

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 # Pythia Foundations
 
 [![nightly-build](https://github.com/ProjectPythia/pythia-foundations/actions/workflows/nightly-build.yaml/badge.svg)](https://github.com/ProjectPythia/pythia-foundations/actions/workflows/nightly-build.yaml)
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 [![DOI](https://zenodo.org/badge/338145160.svg)](https://zenodo.org/badge/latestdoi/338145160)
 
 This is the source repository for the Pythia Foundations content collection.