Remove links from version headers in CHANGELOG.md

This simplifies the format of the raw document to avoid after-the-fact
fixes because someone forgot the link or because of copy-pasta.

Author: mokagio

CHANGELOG.md

@@ -7,7 +7,7 @@ The format of this document is inspired by [Keep a Changelog](https://keepachang
 When releasing a new version:
 
 1. Remove any empty section (those with `_None._`)
-2. Update the `## Unreleased` header to `## [<version_number>](https://github.com/wordpress-mobile/WordPressAuthenticator-iOS/releases/tag/<version_number>)`
+2. Update the `## Unreleased` header to `## <version_number>`
 3. Add a new "Unreleased" section for the next iteration, by copy/pasting the following template:
 
 ## Unreleased
@@ -48,19 +48,19 @@ _None._
 
 _None._
 
-## [5.3.0](https://github.com/wordpress-mobile/WordPressAuthenticator-iOS/releases/tag/5.3.0)
+## 5.3.0
 
 ### New Features
 
 -  Add new config to remove XMLRPC check for site address login [#736]
 
-## [5.2.0](https://github.com/wordpress-mobile/WordPressAuthenticator-iOS/releases/tag/5.2.0)
+## 5.2.0
 
 ### Internal Changes
 
 - Change minimum version of WordPressKit to 6.0.
 
-## [5.1.0](https://github.com/wordpress-mobile/WordPressAuthenticator-iOS/releases/tag/5.1.0)
+## 5.1.0
 
 ### New Features
 
@@ -71,26 +71,26 @@ _None._
 - Fix unresponsive issue in Onboading Questions screen. [#719]
 - Use configuration flag to log custom `step` event for `GetStartedViewController`. [#724]
 
-## [5.0.0](https://github.com/wordpress-mobile/WordPressAuthenticator-iOS/releases/tag/5.0.0)
+## 5.0.0
 
 ### Breaking Changes
 
 - Remove CocoaLumberjack. Use `WPAuthenticatorSetLoggingDelegate` to assign a logger to this library. [#708]
 
-## [4.3.0](https://github.com/wordpress-mobile/WordPressAuthenticator-iOS/releases/tag/4.3.0)
+## 4.3.0
 
 ### New Features
 
 - Make XMLRPC URL optional when verifying WP.com email [#711]
 - A new config is added to skip the XMLRPC check for the site discovery flow [#711]
 
-## [4.2.0](https://github.com/wordpress-mobile/WordPressAuthenticator-iOS/releases/tag/4.2.0)
+## 4.2.0
 
 ### New Features
 
 - New tracking event for XMLRPC related failure. by @selanthiraiyan [#701]
 
-## [4.1.1](https://github.com/wordpress-mobile/WordPressAuthenticator-iOS/releases/tag/4.1.1)
+## 4.1.1
 
 ### New Features
 
@@ -101,7 +101,7 @@ _None._
 
 - There have been [new changes to how `UIPasteboard` works](https://sarunw.com/posts/uipasteboard-privacy-change-ios16/) in iOS 16.0. This makes the unit tests from `PasteboardTests` fail. I have [skipped those tests for iOS 16.0](https://github.com/wordpress-mobile/WordPressAuthenticator-iOS/pull/695/files#diff-ba468f6db6f592cdacdb632f7783a721c5eb856e8ab66765e8e59aabc2c1a7b4R13-R16) and created a GH issue [here](https://github.com/wordpress-mobile/WordPressAuthenticator-iOS/issues/696) to keep track of this. by @selanthiraiyan [#695]
 
-## [4.0.0](https://github.com/wordpress-mobile/WordPressAuthenticator-iOS/releases/tag/4.0.0)
+## 4.0.0
 
 ### Breaking Changes