docs: Better copy (#901)

Author: jancurn

docs/quick-start.md

@@ -1,5 +1,5 @@
 ---
-title: Quick Start
+title: Quick start
 description: Learn how to create, run, and manage Actors using Apify CLI.
 ---
 

website/sidebars.js

@@ -13,7 +13,7 @@ module.exports = [
         {
             type: 'doc',
             id: 'quick-start',
-            label: 'Quick Start',
+            label: 'Quick start',
         },
         {
             type: 'doc',
@@ -27,7 +27,7 @@ module.exports = [
         },
         {
             type: 'category',
-            label: 'Use Cases',
+            label: 'Use cases',
             items: [
                 {
                     type: 'doc',

website/versioned_sidebars/version-1.1.0-sidebars.json

@@ -13,7 +13,7 @@
     {
       "type": "doc",
       "id": "quick-start",
-      "label": "Quick Start"
+      "label": "Quick start"
     },
     {
       "type": "doc",
@@ -27,7 +27,7 @@
     },
     {
       "type": "category",
-      "label": "Use Cases",
+      "label": "Use cases",
       "items": [
         {
           "type": "doc",