Remove Qt 4.8 index.html from qt.index.
Remove Qt 4.8 index.html from qt.index.

That works around an issue with name collision pages in qdoc from Qt5.

Task-number: QTCREATORBUG-8415
Change-Id: I289a80174b006424d54f98410b2635a27258e368
Reviewed-by: Leena Miettinen <885fda02d52616fec24ed5fed9b3f0568fce3ead@digia.com>
Reviewed-by: Jerome Pasion <c10995d24f6b454503389e8d00d837aef038985d@digia.com>

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