Optimize and standardize 'neko' command

[Devparihar5]

• Encapsulated image fetching and embed creation in separate functions.
• Added try...catch for error handling during image fetching.
• Removed dependency on 'config' for the embed color.
• Improved error handling with informative error messages.
• Enhanced code readability with comments and organization.
• Corrected the category determination using '__filename.split'.

[sonarcloud[bot]]

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