DOCS-1: Init document work

Dockerfile

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+FROM golang:1.22-alpine AS builder
+WORKDIR /build
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 go build -o docs-server ./cmd/serve
+
+FROM alpine:3.20
+RUN apk add --no-cache ca-certificates tzdata
+WORKDIR /app
+COPY --from=builder /build/docs-server .
+COPY content  ./content
+COPY static   ./static
+COPY templates ./templates
+
+EXPOSE 8080
+
+ENV PORT=8080 \
+    CONTENT_DIR=/app/content \
+    STATIC_DIR=/app/static \
+    TEMPLATES_DIR=/app/templates \
+    BILLING_DB=/data/billing/arcline-billing.db \
+    DOCS_DB=/data/docs/arcline-docs.db \
+    BILLING_URL=https://portal.arcline.it
+
+CMD ["./docs-server"]