Run hugo via go run and lock its version (#22206)

- Don't rely on obscure docker images like `plugins/hugo`
- Lock down `hugo` to same version the image had used
- Remove unnecessary verbosity in `trans-copy`
- Rename `trans-copy` to `trans-copy.sh`

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: John Olheiser <john+github@jolheiser.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

docs/scripts/trans-copy.sh

@@ -26,7 +26,6 @@ for SOURCE in $(find ${ROOT}/content -type f -iname *.en-us.md); do
     DEST="${SOURCE%.en-us.md}.${LOCALE}.md"
 
     if [[ ! -f ${DEST} ]]; then
-      echo "Creating fallback for ${DEST#${ROOT}/content/}"
       cp ${SOURCE} ${DEST}
       sed -i.bak "s/en\-us/${LOCALE}/g" ${DEST}
       rm ${DEST}.bak