Use mkdocs search boosting instructions for website pages (#3212)

* Exclude Ref SDD from search results

* Update source-tree.md

Author: thomas-bc

Ref/docs/sdd.md

@@ -1,3 +1,8 @@
+---
+search:
+  exclude: true
+---
+
 # Reference Deployment
 
 ## 1. Description

docs/user-manual/overview/source-tree.md

@@ -1,3 +1,8 @@
+---
+search:
+  boost: 0.4
+---
+
 # A Tour of the Source Tree
 
 The following directories constitute the demonstration code. The
@@ -511,4 +516,4 @@ the driver.
 This is the topology module. This is where all the components are
 instantiated and connected together, and the active components are
 started. It is also the location of the C main() function entry point.
-Each deployment (see Section 6.2) will have a module similar to this.
+Each deployment (see Section 6.2) will have a module similar to this.