After investigations, commit the proposed patch by kklimonda presented with the following introduction : cm/templates/site/login_form.html template uses a relative url for the form action, which seems to break deployment in the subfolder when trailing slash is missing (the form redirects to the upper folder breaking login). Using {% url login %} (as in the attached patch) instead would fix the issue.

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\documentclass{article}

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\usepackage{amsmath}

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\usepackage[mathletters]{ucs}

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\usepackage[utf8x]{inputenc}

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\usepackage{listings}

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\lstnewenvironment{code}{\lstset{language=Haskell,basicstyle=\small\ttfamily}}{}

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\setlength{\parindent}{0pt}

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\setlength{\parskip}{6pt plus 2pt minus 1pt}

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\usepackage[T1]{fontenc}