minor about page improvements

website/src/lib/docs/en/about/maps.md

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-# Global and local maps
-
-A large collection of basemaps and overlays to help you craft your next outdoor adventure, or visualize your latest achievement.

website/src/lib/docs/en/about/plot.md

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-# Data visualization
-
-An interactive elevation profile with detailed statistics to analyze recorded activities and future objectives.

website/src/lib/docs/en/about/routing.md

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-# Route planning
-
-An intuitive interface to create itineraries tailored to each sport, based on <a href="https://www.openstreetmap.org" target="_blank">OpenStreetMap</a> data.

website/src/lib/docs/en/about/tools.md

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-# Advanced file processing
-
-A suite of tools for performing all common file processing tasks, and which can be applied to multiple files at once.