Remove contact search doc

The search mechanism documented here currently doesn't work:

user@apertis:~$ folks-inspect search foo

(folks-inspect:13376): folks-WARNING **: 01:48:07.385: backend-store.vala:434: Error preparing Backend 'telepathy': The name org.freedesktop.Telepathy.AccountManager was not provided by any .service files

This functionality is currently not a priority, drop the documentation
since it doesn't work.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

content/docs/contacts-search.md

-+++
-date = "2014-12-17"
-weight = 100
-
-title = "Contacts Search"
-
-aliases = [
-    "/old-wiki/Docs/contacts-search"
-]
-+++
-
-# Contacts search
-
-This allows to search for fields of contacts, and to get the results of
-the search sorted by full name if desired.
-
-## Basic explanation
-
-  - **Query** contains basic definitions (constants, etc.)
-  - **SimpleQuery** contains the search definitions (the query token and
-    fields to match)
-  - **SearchView** provides the means to retrieve the search results
-    (using the query defined in SimpleQuery)
-      - **individuals** returns a Map with the unsorted map of
-        \<Individual.id, Individual\> returned by the search
-      - **sorted_individuals** returns a sorted List of Individuals
-      - For a paged, sorted list, call **get_sorted_page(int
-        page_size, int page_num)**
-
-## Folks-inspect option
-
-A basic search option has been added to folks-inspect. It will search
-the name fields of contacts and output the matching contacts.
-
-Usage:
-
-`folks-inspect search [string]`
-
-## Example
-
-Here is a basic example, extracted from folks-inspect tool
-
-` using Folks;`
-` using Gee;`
-` using GLib;`
-` private class Folks.Inspect.Commands.Search : Folks.Inspect.Command`
-` {`
-`   public Search (Client client)`
-`     {`
-`       base (client);`
-`     }`
-` `
-`   public override async void run (string? command_string)`
-`     {`
-`       if (command_string == null)`
-`         {`
-`           /* A search string is required */`
-`           Utils.print_line ("Please enter a search string");`
-`         }`
-`       else`
-`         {`
-`           var query = new SimpleQuery (`
-`             command_string, Query.MATCH_FIELDS_NAMES);`
-`           var search_view = new SearchView (this.client.aggregator, query);`
-`           try`
-`           {`
-`             yield search_view.prepare ();`
-`           }`
-`           catch (GLib.Error e)`
-`           {`
-`             GLib.warning ("Error when calling prepare: %s\n", e.message);`
-`           }     `
-`           foreach (var individual in search_view.individuals.values)`
-`             Utils.print_individual (individual, true);`
-`         }`
-`     }`
-` }`