Update devDeps, incl. Hugo to 0.155.0

[chalin]

$ (cd public && git diff -bw --ignore-blank-lines -I 'Hugo 0.15|(background|spruce)_hu_|Last modified' -- ':(exclude)*.xml') | grep ^diff | grep -Ev \.jpg
diff --git a/project/index.html b/project/index.html
diff --git a/xx/project/index.html b/xx/project/index.html