Adjust README formatting

README.md

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 # Wavemap
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 <a href="https://github.com/ethz-asl/wavemap/actions/workflows/cpp.yml"><img src="https://img.shields.io/github/actions/workflow/status/ethz-asl/wavemap/cpp.yml?label=C%2b%2b&logo=C%2b%2b&logoColor=white" alt="C++"/></a>
 <a href="https://github.com/ethz-asl/wavemap/actions/workflows/python.yml"><img src="https://img.shields.io/github/actions/workflow/status/ethz-asl/wavemap/python.yml?label=Python&logo=python&logoColor=white" alt="Python"/></a>
 <a href="https://github.com/ethz-asl/wavemap/actions/workflows/ros1.yml"><img src="https://img.shields.io/github/actions/workflow/status/ethz-asl/wavemap/ros1.yml?label=ROS1&logo=ros&logoColor=white" alt="ROS1"/></a>
 <a href="https://github.com/ethz-asl/wavemap/actions/workflows/docs.yml"><img src="https://img.shields.io/github/actions/workflow/status/ethz-asl/wavemap/docs.yml?label=Docs&logo=sphinx&logoColor=white" alt="Docs"/></a>
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 <a href="https://github.com/ethz-asl/wavemap/releases"><img src="https://img.shields.io/github/v/tag/ethz-asl/wavemap?label=Release&logo=github" alt="Release"/></a>
 <a href="https://github.com/ethz-asl/wavemap/blob/main/LICENSE"><img src="https://img.shields.io/badge/License-BSD%203-blue?logo=bsd" alt="License"/></a>
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 [![3D reconstruction of Newer College's Cloister](https://github.com/ethz-asl/wavemap/assets/6238939/e432d4ea-440d-4e9d-adf9-af3ae3b09a10)](https://www.youtube.com/live/ftQhK75Ri1E?si=9txTYyJ78wQuhyN-&t=733)
 
 ## Hierarchical, multi-resolution volumetric mapping