database: pagedao: Add findByTitle()

database/pagedaosqlite.h

@@ -20,6 +20,7 @@ class PageDaoSqlite : public PageDao, protected SqliteDao
 	bool exists(std::string name) const override;
 	void save(const Page &page) override;
 	std::optional<Page> find(std::string name) override;
+	std::optional<Page> findByTitle(std::string title) override;
 	std::optional<Page> find(unsigned int id) override;
 	std::vector<std::string> getPageList(QueryOption option) override;
 	std::vector<std::string> fetchCategories(std::string pagename, QueryOption option) override;