Add releases screenshot; remove WordPress references

Author: n7studios

.github/docs/new-release.png

@@ -89,4 +89,4 @@ When you're happy with the above, click `Publish Release`.
 
 This will then make the release available to developers, who can include it manually or using composer.
 
-The release will also be available to view on the [Releases](https://github.com/ConvertKit/convertkit-wordpress/releases) section of this GitHub repository.
+The release will also be available to view on the [Releases](https://github.com/ConvertKit/convertkitsdk-php/releases) section of this GitHub repository.

DEPLOYMENT.md

@@ -3,7 +3,7 @@
 This document describes how to setup your development environment, so that it is ready to run, develop and test the ConvertKit PHP SDK.
 
 Suggestions are provided for the LAMP/LEMP stack and Git client are for those who prefer the UI over a command line and/or are less familiar with 
-WordPress, PHP, MySQL and Git - but you're free to use your preferred software.
+PHP, MySQL and Git - but you're free to use your preferred software.
 
 ## Setup
 
@@ -127,7 +127,7 @@ is setup successfully.
 ### Running PHPStan
 
 In the Plugin's directory, run the following command to run PHPStan, which will perform static analysis on the code, checking it meets required
-standards, that PHP DocBlocks are valid, WordPress action/filter DocBlocks are valid etc:
+standards, that PHP DocBlocks are valid etc:
 
 ```bash
 vendor/bin/phpstan --memory-limit=1G

SETUP.md

@@ -27,7 +27,6 @@ Tests are written in PHP using [PHPUnit](https://phpunit.de/), and the existing
 [PHPStan](https://phpstan.org) performs static analysis on the Plugin's PHP code.  This ensures:
 
 - DocBlocks declarations are valid and uniform
-- DocBlocks declarations for WordPress `do_action()` and `apply_filters()` calls are valid
 - Typehinting variables and return types declared in DocBlocks are correctly cast
 - Any unused functions are detected
 - Unnecessary checks / code is highlighted for possible removal