small docs refactor (#749)

Author: Brazol

docusaurus/docs/Flutter/05-advanced/01-deeplinking.mdx

@@ -1,3 +1,9 @@
+---
+id: call_deep_linking
+sidebar_position: 1
+title: Call Deep Linking
+---
+
 # Implementing Call Deep Linking
 
 It's common in mobile calling apps that a call can be started from a link, that should start the app and dial in immediately. This can be accomplished by [universal links on iOS](https://developer.apple.com/ios/universal-links/) and [App links on Android](https://developer.android.com/training/app-links).

docusaurus/docs/Flutter/05-advanced/02-ringing.mdx

@@ -1,7 +1,7 @@
 ---
-id: adding_ringing_and_callkit
+id: ringing_and_callkit
 sidebar_position: 2
-title: Adding Ringing and CallKit
+title: Ringing and CallKit
 ---
 
 Adding Ringing And CallKit To Your Application

docusaurus/docs/Flutter/05-advanced/05-call-recording.mdx

@@ -1,5 +1,6 @@
 ---
 slug: /recording
+sidebar_position: 5
 title: Recording
 ---
 A key feature of modern communication tools is the ability to quickly and easily record calls. This functionality is used for everything from quality assurance and training to legal compliance or simply as a matter of convenience for keeping track of conversations and later reviewing them.

docusaurus/docs/Flutter/05-advanced/06-screenshots.mdx

@@ -1,5 +1,6 @@
 ---
 slug: /screenshots
+sidebar_position: 6
 title: Screenshots
 ---
 You can take a picture of a VideoTrack at highest possible resolution. This can be useful for example if you want to take a screenshot of a screenshare at full resolution.

docusaurus/docs/Flutter/05-advanced/07-background-modes.mdx

@@ -1,6 +1,7 @@
 ---
 title: Background modes
 slug: /background-modes
+sidebar_position: 7
 description: How to keep the call alive in the background
 ---