chore: typo in "Evaluation Process"

chore: change size of gif

chore: new puzzle gif

chore: change font of figure's description to italic

docs: add new section with gif -> "Live Demo: The Bot in Action"

chore: omitting some media files (mp4, mov)

chore: add .gitattributes to exclude ipynb from linguist stats

docs: add a link to the documentation "Model Loading Guide"

chore: allow puzzle file in gitignore

test: add puzzle file for chess engine testing

docs: add link to published pre-trained models

doc: fix small typo

chore: ignore exported models files

refactor: new path for importing `fen_to_tensor` function

docs: new docs related to loding models, quick start and realease v1.0.0 description