Add /embed endpoint

This duplicates the share endpoint. It uses the Share Page template
with a boolean for share vs embed to toggle displaying the navbar
and toolbar.

Added a showToolbar property to brewRender to toggle... showing
the toolbar.

client/homebrew/brewRenderer/brewRenderer.jsx

@@ -102,6 +102,7 @@ const BrewRenderer = (props)=>{
 		currentBrewRendererPageNum : 1,
 		themeBundle                : {},
 		onPageChange               : ()=>{},
+		showToolbar                : true,
 		...props
 	};
 
@@ -297,6 +298,8 @@ const BrewRenderer = (props)=>{
 	const renderedStyle = useMemo(()=>renderStyle(), [props.style, props.themeBundle]);
 	renderedPages = useMemo(()=>renderPages(), [props.text, displayOptions]);
 
+	const toolbarEl = <ToolBar displayOptions={displayOptions} onDisplayOptionsChange={handleDisplayOptionsChange} visiblePages={state.visiblePages.length > 0 ? state.visiblePages : [state.centerPage]} totalPages={rawPages.length} headerState={headerState} setHeaderState={setHeaderState}/>;
+
 	return (
 		<>
 			{/*render dummy page while iFrame is mounting.*/}
@@ -314,7 +317,7 @@ const BrewRenderer = (props)=>{
 				<NotificationPopup />
 			</div>
 
-			<ToolBar displayOptions={displayOptions} onDisplayOptionsChange={handleDisplayOptionsChange} visiblePages={state.visiblePages.length > 0 ? state.visiblePages : [state.centerPage]} totalPages={rawPages.length} headerState={headerState} setHeaderState={setHeaderState}/>
+			{props.showToolbar ? toolbarEl : ''}
 
 			{/*render in iFrame so broken code doesn't crash the site.*/}
 			<Frame id='BrewRenderer' initialContent={INITIAL_CONTENT}