Twitter fix

[murdercode]

This pull request includes a significant update to the getOembed method in the TwitterShortcode class to improve error handling and code readability.

Error handling improvements:

• src/Shortcodes/TwitterShortcode.php: Added a check to return null if the curl_exec function fails and modified the JSON decoding to return an associative array. This ensures that the method handles errors more gracefully and avoids potential null pointer exceptions.

Code readability improvements:

• src/Shortcodes/TwitterShortcode.php: Refactored the curl_setopt_array call to separate curl_setopt calls for better readability and maintainability.