Give better titles to documentation pages (#1064)

* Fix title on workers page

* Fix jobs title

* Fix results title

* Fix title on overview page

docs/docs/index.md

@@ -1,5 +1,5 @@
 ---
-title: "RQ: Documentation"
+title: "RQ: Documentation Overview"
 layout: docs
 ---
 

docs/docs/jobs.md

@@ -1,5 +1,5 @@
 ---
-title: "RQ: Documentation"
+title: "RQ: Jobs"
 layout: docs
 ---
 

docs/docs/results.md

@@ -1,5 +1,5 @@
 ---
-title: "RQ: Documentation"
+title: "RQ: Results"
 layout: docs
 ---
 

docs/docs/workers.md

@@ -1,5 +1,5 @@
 ---
-title: "RQ: Simple job queues for Python"
+title: "RQ: Workers"
 layout: docs
 ---