Rewrite documentation index

My biggest regret is that many excellent @riordan words must be removed,
since most Pelias descriptions are over in pelias/pelias.

index.md

@@ -1,14 +1,20 @@
-[Mapzen Search](https://mapzen.com/projects/search) is a modern, geographic search service based entirely on open-source tools and powered entirely by open data. Through a process known as [geocoding](search.md), Mapzen Search allows you to use natural language to find a particular place by entering an address or the name of a landmark or business, and then translates the result in to the geographic coordinates used by computers.
+# Pelias Documentation
 
-Mapzen Search accesses [global databases](data-sources.md) of place names and locations, but you can receive more locally relevant search results by limiting the search to a particular radius around a location (such as a cell phone), region, or country. With text [autocompletion capabilities](autocomplete.md), you can search for places and match against Mapzen Search data in real-time.
+Here is where you can find all documentation for the [Pelias geocoder](https://github.com/pelias/pelias/).
 
-Mapzen Search also enables the opposite workflow, known as [reverse geocoding](reverse.md), to transform latitude and longitude values in to a list of places. This process attempts to find the name and address of the place nearest a longitude and latitude pair. For example, you can click a position on the map to learn which business is located there.
-
-## Features of Mapzen Search
+## Table of Contents
 
+### Core Features and API Documentation
 - [Forward geocoding](search.md) to find a place by searching for an address or name
 - [Reverse geocoding](reverse.md) to find what is located at a certain coordinate location
 - [Autocomplete](autocomplete.md) to give real-time result suggestions without having to type the whole location
 - [Global coverage with prioritized local results](search.md#prioritize-results-by-proximity)
-- Open-source software using [open data sources](data-sources.md)
+- [Structured Geocoding](structured-geocoding.md) to find a place with data already separated into housenumber, street, city, etc
+- [Glossary of common terms](glossary.md)
+
+### Data Sources
+- [Pelias data sources](data-sources.md)
 - [Tools for embedding search](https://mapzen.com/documentation/mapzen-js/search/) in a map
+
+### Running your own Pelias
+- [Pelias installation guide](https://github.com/pelias/pelias/blob/master/INSTALL.md)