Use Starlette, uvicorn and websockets; rename Docker files to container ones

Serve neo4j-browser with Starlette and uvicorn (the optional browser extra)
instead of a hand-written HTTP server, and handle Bolt over WebSocket with the
websockets library's Sans-I/O protocol. Rename Dockerfile, .dockerignore and
docker/ to Containerfile, .containerignore and container/.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

pyproject.toml

@@ -13,7 +13,7 @@ license = "GPL-3.0-or-later"
 license-files = ["LICENSE"]
 authors = [{ name = "Bart Broere" }]
 requires-python = ">=3.11"
-dependencies = ["psycopg>=3.1"]
+dependencies = ["psycopg>=3.1", "websockets>=13"]
 keywords = ["neo4j", "bolt", "cypher", "postgresql", "apache-age", "graph"]
 classifiers = [
     "Development Status :: 3 - Alpha",
@@ -23,6 +23,7 @@ classifiers = [
 
 [project.optional-dependencies]
 binary = ["psycopg[binary]>=3.1"]
+browser = ["starlette>=0.37", "uvicorn>=0.29"]
 
 [project.urls]
 Source = "https://git.bartbroe.re/bartbroere/peo"