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Update the security.md based on some advice we got :)
### Changes 🏗️
- Adds an update time window and clarifies time spans
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Huntr isn't offering a security bounty for autogpt at the moment so
remove it in favor of github security adviosories
### Changes 🏗️
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comments out huntr line in case they decide to offer it again in the
future
Restructuring the Repo to make it clear the difference between classic autogpt and the autogpt platform:
* Move the "classic" projects `autogpt`, `forge`, `frontend`, and `benchmark` into a `classic` folder
* Also rename `autogpt` to `original_autogpt` for absolute clarity
* Rename `rnd/` to `autogpt_platform/`
* `rnd/autogpt_builder` -> `autogpt_platform/frontend`
* `rnd/autogpt_server` -> `autogpt_platform/backend`
* Adjust any paths accordingly
