add copy-url-with-page to share/edit pages

Adds a "copy url (page N)" option to the Share dropdown (edit page) and
the source dropdown (share page). Copies a URL with a #pN hash anchor.
The existing scrollToHash handler in brewRenderer already navigates to
the correct page when the URL is opened.

client/homebrew/pages/editPage/editPage.jsx

@@ -365,7 +365,7 @@ const EditPage = (props)=>{
 				<PrintNavItem />
 				<HelpNavItem />
 				<VaultNavItem />
-				<ShareNavItem brew={currentBrew} />
+				<ShareNavItem brew={currentBrew} currentPage={currentBrewRendererPageNum} />
 				<RecentNavItem brew={currentBrew} storageKey='edit' />
 				<AccountNavItem/>
 			</Nav.section>