cleaned up unused pages

src/containers/Dashboard/Dashboard.js

src/containers/Pages/404/404.js

src/containers/Pages/404/404.styles.js

src/containers/Pages/500/500.js

src/containers/Pages/500/500.styles.js

src/containers/Pages/ForgotPassword/ForgotPassword.js

src/containers/Pages/ForgotPassword/ForgotPassword.styles.js

src/containers/Pages/ResetPassword/ResetPassword.js

src/containers/Pages/ResetPassword/ResetPassword.styles.js

src/containers/Pages/SignUp/SignUp.js

src/containers/Pages/SignUp/SignUp.styles.js

src/containers/Tables/AntTables/AntTables.js

src/containers/Tables/AntTables/AntTables.styles.js

src/containers/Tables/AntTables/Demo.styles.js

src/containers/Tables/AntTables/TableViews/CustomizedView.js

src/containers/Tables/AntTables/TableViews/EditView.js

src/containers/Tables/AntTables/TableViews/FilterView.js

src/containers/Tables/AntTables/TableViews/GroupView.js

src/containers/Tables/AntTables/TableViews/SimpleView.js

src/containers/Tables/AntTables/TableViews/SortView.js