refactor: AutoGPT Platform Stealth Launch Repo Re-Org (#8113)

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

.dockerignore

@@ -1,40 +0,0 @@
-# Ignore everything by default, selectively add things to context
-*
-
-# AutoGPT
-!autogpt/autogpt/
-!autogpt/pyproject.toml
-!autogpt/poetry.lock
-!autogpt/README.md
-!autogpt/tests/
-
-# Benchmark
-!benchmark/agbenchmark/
-!benchmark/pyproject.toml
-!benchmark/poetry.lock
-!benchmark/README.md
-
-# Forge
-!forge/forge/
-!forge/pyproject.toml
-!forge/poetry.lock
-!forge/README.md
-
-# Frontend
-!frontend/build/web/
-
-# rnd
-!rnd/
-
-# Explicitly re-ignore some folders
-.*
-**/__pycache__
-# rnd
-rnd/autogpt_builder/.next/
-rnd/autogpt_builder/node_modules
-rnd/autogpt_builder/.env.example
-rnd/autogpt_builder/.env.local
-rnd/autogpt_server/.env
-rnd/autogpt_server/.venv/
-
-rnd/market/.env