Added .git to .dockerignore and unignored some files

Removed LICENSE, PRIVACY.md, and SPONSORS.json from .dockerignore. Although they don't affect the functionalities of the bot, we prefer to include them due to their respective purposes.

Signed-off-by: Taku <45324516+Taaku18@users.noreply.github.com>

Author: Taaku18

.dockerignore

@@ -140,17 +140,15 @@ test.py
 # Other stuff
 .dockerignore
 .env.example
+.git/
 .gitignore
 .github/
 app.json
 CHANGELOG.md
 Dockerfile
 docker-compose.yml
-LICENSE
-PRIVACY.md
 Procfile
 pyproject.toml
 README.md
 Pipfile
 Pipfile.lock
-SPONSORS.json