[Strategic] Action: Test front page with moved search form

[Dermot McNally]

An update on this - because it will be a few days before I can do much
on this again, I've made some of the simpler changes already and
updated my github version. The changes against the version I described
earlier are:

* "Where am I?" is now called "Where is this?" and has been moved to
the permalink area. I'm not advocating this new name in particular,
but I think it's a better description of what the link does. Likewise,
I'm pretty sure the permalink area isn't where this should live but
there's no room for it in the slimline search form and it doesn't
really belong there anyway. See my earlier comments for more thoughts
on what we could do with this.

* As per SteveC's suggestion, there is no more "Search" title on the
form, the word "Search" instead appearing in the button. Note that
this has required widening the button, and, to most simply stay within
the container, reducing the width of the text field. I'm a little
concerned about the variation in button width that we might have
across different languages, where "go" seems to have been compact
enough across the board.

* The in-form examples are now gone, replaced with a link to what I've
for now called "Acceptable formats...". I do intend to adopt SteveC's
disappearing-grey-text suggestion, but that'll need some JavaScript
and I'm too tired to write that just now. I also feel that the link,
whatever it ends up being called, should not take you away from the
map page and certainly shouldn't link to the big Nominatim article. So
it probably wants to make a small popup/dialogue appear with the same
sort of examples as I removed, though probably there'll be room for a
few more of them.

Dermot

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