Before this commit, there are 3 node_modules directory:
* one in .
* two others in ./searx/statics/themes/*
This is no desirable:
* it declares the npm depdenencies in the shell script.
* dependabot can't updates theses dependencies.
* this is a not standard way to build a package (two different locations for the dependencies).
With this commit and the PR #150 there is one unique node_modules directory per theme.
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