build: remove unecessary files in final image

These aren't needed anymore because we started embedding `static` and
`templates` directly into the binary, so that makes it easier to:

1. Distribute
2. Setup
3. Run

Dockerfile

@@ -4,8 +4,8 @@ WORKDIR /app
 
 COPY go.mod go.sum ./
 
+# this is needed because we embed these files into the binary
 COPY static/ ./static/
-
 COPY templates/ ./templates
 
 RUN go mod download
@@ -17,7 +17,5 @@ RUN CGO_ENABLED=0 GOOS=linux go build -o /abyss
 FROM scratch
 
 COPY --from=builder /abyss /abyss
-COPY --from=builder /app/static /static
-COPY --from=builder /app/templates /templates
 
 CMD ["/abyss"]