Add discord-link and cleanup README (pester#2102)

Co-authored-by: nohwnd <[email protected]>

Author: fflaten

README.md

@@ -63,7 +63,7 @@ Save this code example in a file named `Get-Planet.Tests.ps1`, and run `Invoke-P
 
 Learn how to [start quick with Pester](https://pester.dev/docs/quick-start) in our docs.
 
-The example above also has an [annotated and production ready version here](Examples/Planets).
+The example above also has an [annotated and production ready version here](docs/Examples/Planets).
 
 ## Installation
 
@@ -99,7 +99,7 @@ Describe 'Notepad' {
 }
 ```
 
-Learn more about assertions in [our documentation](https://pester.dev/docs/usage/assertions).
+Learn more about assertions in [our documentation](https://pester.dev/docs/assertions/should-command).
 
 ### Mocking
 
@@ -164,7 +164,7 @@ Do you like what you see? Learn how to use Pester with our [quick start guide](h
 
 Got questions or you just want to get in touch? Use our issues page or one of these channels:
 
-[![Pester Twitter](images/readme/twitter-64.PNG)](https://twitter.com/PSPester) [![Pester on StackOverflow](images/readme/stack-overflow-64.PNG)](https://stackoverflow.com/questions/tagged/pester) [![Testing channel on Powershell Slack](images/readme/slack-64.PNG)](https://powershell.slack.com/messages/C03QKTUCS) or try github discussions <a href="https://github.com/pester/Pester/discussions"><img src="https://github.githubassets.com/images/modules/logos_page/GitHub-Mark.png" alt="GitHub discussions" height="64"></a>.
+[![Pester Twitter](images/readme/twitter-64.PNG)](https://twitter.com/PSPester) [![Pester on StackOverflow](images/readme/stack-overflow-64.PNG)](https://stackoverflow.com/questions/tagged/pester) [![Testing channel on Powershell Slack](images/readme/slack-64.PNG)](https://powershell.slack.com/messages/C03QKTUCS) [![Testing channel on Powershell Discord](images/readme/discord-64.PNG)](https://discord.gg/powershell) or try github discussions <a href="https://github.com/pester/Pester/discussions"><img src="https://github.githubassets.com/images/modules/logos_page/GitHub-Mark.png" alt="GitHub discussions" height="64"></a>.
 
 ## Sponsored by
 

docs/images/logo.png

@@ -8,7 +8,7 @@
     <description>Pester is testing framework for PowerShell, written in PowerShell.</description>
     <tags>powershell unit testing bdd tdd mocking admin</tags>
     <authors>Pester Team</authors>
-    <iconUrl>https://raw.githubusercontent.com/pester/pester/master/images/pester.PNG</iconUrl>
+    <iconUrl>https://raw.githubusercontent.com/pester/pester/main/images/pester.PNG</iconUrl>
     <projectUrl>https://github.com/Pester/Pester</projectUrl>
     <licenseUrl>http://www.apache.org/licenses/LICENSE-2.0.html</licenseUrl>
   </metadata>

docs/images/pester.PNG

@@ -107,7 +107,7 @@
             Tags         = @('powershell', 'unit_testing', 'bdd', 'tdd', 'mocking', 'PSEdition_Core', 'PSEdition_Desktop', 'Windows', 'Linux', 'MacOS')
 
             # The web address of an icon which can be used in galleries to represent this module
-            IconUri      = 'https://raw.githubusercontent.com/pester/Pester/master/images/pester.PNG'
+            IconUri      = 'https://raw.githubusercontent.com/pester/Pester/main/images/pester.PNG'
 
             # The web address of this module's project or support homepage.
             ProjectUri   = "https://github.com/Pester/Pester"