Add 'Remove HTML block'

Remove-HTML-block.md

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+Users can paste text into the Omeka HTML block. This is undesirable because html style and classes are included in the html.
+
+We de not want unexpected formats.
+
+For this reason we have developed the Markdown text module. Markdown allows basic HTML formatting without extra unwanted text formatting.
+
+But we also want to remove the HTML block so users cannot include it in their pages.
+
+You need to copy the page template from the omeka core into the arcHIVE theme.
+
+From the omeka core copy `./application/view/omeka/site-admin/page/edit.phtml`
+
+And paste it into the arcHIVE theme `./view/omeka/site-admin/page/edit.phtml`
+
+Then edit the new file, adding the line `<?php if ($layout == "html") { continue; } ?>`
+
+```
+    <?php foreach ($this->blockLayout()->getLayouts() as $layout): ?>
+-->>      <?php if ($layout == "html") { continue; } ?>
+    <button type="button" value="<?php echo $escape($layout); ?>" class="option">
+        <?php echo $escape($translate($this->blockLayout()->getLayoutLabel($layout))); ?>
+    </button>
+    <?php endforeach; ?>
+```