nginx autoindex: css/xslt

[naggie]

header/footer method results in double head/body.

XSLT based alternative: https://github.com/gibatronic/ngx-superbindex

Mechanism can be used for alternate css.

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https://gist.github.com/wilhelmy/5a59b8eea26974a468c9

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https://stackoverflow.com/questions/27344642/how-to-edit-index-of-etc-pages-on-nginx-and-make-them-responsive ---- best/easiest/correct-est solution IMO -- autoindex + sub to insert CSS

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could alternatively use JSON autoindex with JS client -- advantage is this becomes an API.