Update README and consolidate Dockerfiles. Change default submission

See merge request !21

model to be the torchbeast baseline, using only one GPU. Adjust the
baseline to only use the new blstats.

Fix repo structure tree and update `aicrowd.json`

See merge request nethack/neurips-2021-the-nethack-challenge!17

This reverts commit f8425bfa

Dipam/updates

See merge request !15

Merge from Master

See merge request !14

Improve Torchbeast Baseline Instructions

See merge request !13

Fix TOC, change images, other minor changes

See merge request !11

# Conflicts:
#   README.md

Update README & Bugfixes

See merge request !12