Add docs navigation and tighten API request security

docs/gitbook/server-plugin.md

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+# Capture your Minecraft world
+
+This page is for players who want to make a map. If you only want to guess locations, you can skip it!
+
+## Before you start
+
+You need Minecraft Java and the matching MineGeo capture mod from [Downloads](https://minegeo.vercel.app/downloads). The page lists the supported Minecraft versions and what to install alongside it.
+
+If mod installation is new to you, ask a friend or server owner for help with that part. Choose the download matching your Minecraft version. Your server does not need its own MineGeo plugin for you to use the capture mod.
+
+## Capture a new map
+
+1. Open Minecraft with the capture mod installed.
+2. Join the world or server you want to show.
+3. Press **G** to open MineGeo's capture panel.
+4. Follow the sign-in steps to connect your MineGeo account.
+5. For a new map, leave **Add to map ID** empty.
+6. Capture at least **five different viewpoints**, up to 24, then upload.
+7. Return to **My account** on MineGeo and open your map when it is ready.
+
+A viewpoint is the place you stand when taking a view. Spread them around interesting parts of the world so players have something to recognize.
+
+## Pick useful views
+
+- Show landmarks, paths, rivers, hills, and buildings.
+- Check the view is clear rather than completely blocked by a wall.
+- Capture places you have permission to share.
+- Preview the finished pictures before sending the map for review.
+
+## What if my server owner handles maps?
+
+Ask them whether they can make a map with MineGeo's server plugin. You do not need to type server commands or manage the server yourself.
+
+## Adding views to someone else's map?
+
+Read **Contribute panoramas** first. You will need the owner's map ID, which tells MineGeo which map should receive your views.