CXX-1587 update site generation for modern hugo

Author: rcsanchez97

docs/content/index.md renamed to docs/content/_index.md

@@ -10,8 +10,8 @@ Welcome to the MongoDB C++ driver.  On this site, you'll find documentation
 to help you get the most from MongoDB and C++.  If you're just starting
 out, take a look at these pages first:
 
-* [Installing mongocxx]({{< ref "mongocxx-v3/installation.md" >}})
-* [Quick-start tutorial]({{< ref "mongocxx-v3/tutorial.md" >}})
+* [Installing mongocxx]({{< ref "/mongocxx-v3/installation" >}})
+* [Quick-start tutorial]({{< ref "/mongocxx-v3/tutorial" >}})
 
 ## Driver status by family and version
 

docs/content/legacy-v1/installation.md

@@ -355,7 +355,7 @@ mongoclient-gd.pdb
 #### Initialization and Configuration
 
 NOTE: You *must* initialize the legacy driver before use.  See
-[Configuration]({{< ref "legacy-v1/configuration.md" >}}) for more details.
+[Configuration]({{< ref "/legacy-v1/configuration" >}}) for more details.
 
 #### Client Headers
 

docs/content/legacy-v1/tutorial.md

@@ -26,12 +26,12 @@ contents of a database after your C++ program runs.
 
 ### Installing the Driver Library and Headers
 
-Please see [Installation]({{< ref "legacy-v1/installation.md" >}}) for
+Please see [Installation]({{< ref "/legacy-v1/installation" >}}) for
 instructions on how to download, build, and install the C++ client driver.
 
 ### Initializing the Driver Library
 
-Please see [Configuration]({{< ref "legacy-v1/configuration.md" >}}) for
+Please see [Configuration]({{< ref "/legacy-v1/configuration" >}}) for
 instructions on how to properly initialize and terminate the driver:
 
 ### Connecting
@@ -158,8 +158,7 @@ GENOID should be at the beginning of the generated object. We can do something s
 BSONObj p = BSONObjBuilder().genOID().append("name","Joe").append("age",33).obj();
 ```
 
-Other helpers are listed in [Working with BSON]({{< ref
-"legacy-v1/working-with-bson.md" >}}).
+Other helpers are listed in [Working with BSON]({{< ref "/legacy-v1/working-with-bson" >}}).
 
 ### Inserting
 

docs/content/mongocxx-v3/tutorial.md

@@ -12,7 +12,7 @@ title = "Tutorial for mongocxx"
 - A [mongod](https://docs.mongodb.com/master/reference/program/mongod/)
   instance running on localhost on port 27017.
 
-- The mongocxx Driver. See [Installation for mongocxx]({{< ref "mongocxx-v3/installation.md" >}}).
+- The mongocxx Driver. See [Installation for mongocxx]({{< ref "/mongocxx-v3/installation" >}}).
 
 - The following statements at the top of your source file:
 

docs/themes/mongodb/layouts/index.html

@@ -1,6 +1,6 @@
 {{ partial "header.html" . }}
 {{ $.Scratch.Set "indexFound" false }}
-{{ range where .Data.Pages ".Type" "index" }}
+{{ range where .Site.Pages ".Type" "index" }}
     {{ $.Scratch.Set "indexFound" true }}
     {{ .Content }}
 {{ end }}