📖 Add OBITools documentation (obidoc) management and update Hugo to 0.159.2

- Add new `--update-obidoc` and clarify existing ` --build_obodc`
- Document obiDoc build process, first install & update workflow
- Update Hugo version from 0.140.2 to 0.159.3 (extended for SCSS)
- Add `golang-go` dependency to builder image
- Enhance obidoc build command: add --gc, minify and draft support

obijupyterhub/Dockerfile.builder

@@ -33,6 +33,7 @@ RUN apt-get update \
        libtiff5-dev \
        libjpeg-dev \
        libuv1-dev \
+       golang-go \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
@@ -44,7 +45,7 @@ RUN mkdir -p ${R_LIBS_BUILDER} \
 
 # Install Hugo (extended version for SCSS support)
 # Detect architecture and download appropriate binary
-ARG HUGO_VERSION=0.140.2
+ARG HUGO_VERSION=0.159.2
 RUN ARCH=$(dpkg --print-architecture) \
     && case "$ARCH" in \
          amd64) HUGO_ARCH="amd64" ;; \