docs: Add some slight organization.

docs/app_development.md

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+@page app_development App Development
+
+- @subpage app_development_cheat_sheet
+- @subpage app_development_guide

docs/app_development_cheat_sheet.md

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-# App Development Cheat Sheet
+@page app_development_cheat_sheet App Development Cheat Sheet
 
 Making apps for the impatient tilde friend.
 

docs/app_development_guide.md

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-# App Development Guide
+@page app_development_guide App Development Guide
 
 A Tilde Friends application starts with code that runs on a Tilde Friends server, possibly far away from where you wrote it, in a little JavaScript environment, in its own restricted process, with the only access to the outside world being the ability to send messages to the server. This document gives some recipes showing how that can be used to build a functional user-facing application in light of the unique constraints present.
 

docs/connecting_manyverse.md

@@ -1,3 +1,5 @@
+@page connecting_manyverse How to Connect Manyverse
+
 # Connecting with Manyverse
 
 Communication with [Manyverse](https://www.manyver.se/) should Just Work (tm).

docs/howto.md

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+@page howto How To
+
+- @subpage upgrading
+- @subpage transfer_account
+- @subpage connecting_manyverse

docs/inspiration.md

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-# Inspiration
+@page inspiration Inspiration
 
 This is an ever-growing list of software that is similar to what Tilde Friends tries to be but as far as I can tell don't quite fit the same niche.
 

docs/model.md

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-# Model
+@page model Model
 
 A reasonable mental model of Tilde Friends is as a virtual computer. User
 interace is through a web browser. Communication with the outside world is

docs/overview.md

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+@page overview Overview
+
+- @subpage inspiration
+- @subpage model
+- @subpage vision

docs/transfer_account.md

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-# How to Transfer an Account
+@page transfer_account How to Transfer an Account
 
 Secure Scuttlebutt accounts can be easily transferred between apps and devices.
 

docs/upgrading.md

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-# Upgrading
+@page upgrading Upgrading
 
 Tilde Friends can be upgraded simply by running a new executable against an
 existing database.

docs/vision.md

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-# Vision
+@page vision Vision
 
 Tilde Friends is a tool for making and sharing.