Add the help page, link it to the help widget.

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+# How to use this wiki
+
+On the top left, is the logo, beside that is a toolbar of icons -
+
+- ❓ hover over this for help.
+- 🍔 hides or shows everything but the content and these icons, the reverse hamburger menu.
+- 🕶  switches between dark and light themes.
+- 📚 shows the list of all pages.
+- 🔮 a folder of unsorted pages.
+- 👥 shows the list of users.
+- 🪵 will be for logging in, when I have written that bit.
+- 🔍 will be the search, when I have written that bit.
+
+👣 is a trail of breadcrumbs, though I'm using a footsteps icon
+for this.  Showing the footsteps you have followed to get to the current
+folder.
+
+On the top right of the pages is links to the sub folders of the current
+folder the current page is in.
+
+Down the left side is links to the pages in the current folder.  Most of
+them will be symlinks to the converted pages from the Foswiki and PmWiki
+sub folders.  Some will be links ☝ to external sites.  For the
+current page, links to the headings are also shown, those headings have
+their own icon 👆 to go back to the top.
+
+The bit you are reading is the badly converted content of the current
+page.  At the bottom of each converted page is a link to the original,
+and if you are logged into that other system, you might be able to edit
+the page.  Note that unconverted pages don't have these links to the
+originals.
+
+At the bottom is links to things like page history, web site source code,
+and the software I'm writing to do all of this.  Or should be some day.
+
+
+
+# Under the hood
+
+Internally this wiki is made of the root folder and it's sub
+folders representing the structure of the wiki content.  Each
+folder has it's own pages.