rework page metadata and links

website/src/lib/docs/en/home/funding.md

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+# Help keep the website free (and ad-free) 🙏
+
+Each time you add or move GPS points, we make a request to our servers to retrieve a route on the road network.
+We also rely on APIs from <a href="https://mapbox.com" target="_blank">Mapbox</a> to load beautiful maps, retrieve elevation data and process geocoding requests (looking for a place in the search bar).
+Unfortunately this is very costly so if you like the tool and use it frequently, please consider making even a small donation so that this website can stay **free** and **ad-free**.
+
+Thank you very much for your support! ❤️

website/src/lib/docs/en/home/mapbox.md

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+Mapbox is the company that provides some of the beautiful maps on this website.
+They also develop the <a href="https://github.com/mapbox/mapbox-gl-js" target="_blank">map engine</a> which powers *gpx.studio*.
+
+We are incredibly lucky and grateful to have joined their <a href="https://mapbox.com/community" target="_blank">Community</a> program, which supports nonprofits, educational institutions, and positive impact organizations.
+This means that *gpx.studio* can benefit from Mapbox tools at discounted prices, which greatly contributes to the financial viability of the project and to offering the best possible user experience.

website/src/lib/docs/en/home/translation.md

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+# Translation 🗣
+
+The website is translated by volunteers on a collaborative translation platform.
+You can help complete and improve the translations by joining the <a href="https://crowdin.com/project/gpxstudio" target="_blank">Crowdin project</a>.
+[Get in touch](#contact) if you would like to start the translation in a new language.
+
+Any help is greatly appreciated!