Add paginated help pages with Prev/Next navigation and update README

[MNTGXO]

Motivation

• Provide a complete, easy-to-browse in-bot help that lists all commands and features while keeping each help page concise (~10 lines).
• Allow users to navigate the help content in PM via Previous/Next buttons instead of showing a single long message.

Description

• Added HELP_PAGES to Script.py and reworked HELP_TXT to provide an intro plus six concise help pages grouped by feature/command areas.
• Updated plugins/pm_filter.py help callback to render the first help page and added help_page_<n> handlers with circular Prev/Next navigation and a page indicator button.
• Injected a new "Commands & Bot Features" section into README.md enumerating the full command list and feature highlights to match the in-bot help.
• Changes touch the following files: Script.py, plugins/pm_filter.py, and README.md.

Testing

• Ran Python syntax validation with python -m py_compile Script.py plugins/pm_filter.py, which completed without errors.
• Verified the modified help rendering code paths by static inspection of plugins/pm_filter.py to ensure help and help_page_<n> callbacks format and button layouts reference script.HELP_PAGES correctly.

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