[tox] Update doc testenv to account for documentation restructuring * Build doc from `doc` directory. * Use `sphinx-build` directly instead of `make` as this now works and allows to build within .tox temporary environment (instead of doc/_build), preferable for a "test" action. Related to #5447161.

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* {

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  color: #000 !important;

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}

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div#popupLoginBox,

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div#popupLoginBox,

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img#logo, div.header,

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#navColumnLeft, #navColumnRight,

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#footer {

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  display: none

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}

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div#pageContent{

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  border: none;

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}