Fallback to `index.htm` when `index.html` does not exist
What does this MR do?
This MR fixes the issue Allow use of other index extensions (htm, xhtml... (gitlab#355981).
Detail: The code should look for the correct index file to display the GitLab Pages
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index.htmlwill take highest precedence -
index.htmwill be checked only ifindex.htmlis not there - If both are present for some reason,
index.htmlwill get served
Edited by Kassio Borges