Create next previous buttons on Single Alert Page

[elsatamara]

Things to-do:

• [x] The first item on the alert list should have the previous button disabled
• [x] The last item on alert list should have next button disabled
• [x] UI of the prev and next button should have the text "next" and "previous" along with the regulator name of the next and previous alert on the alert list
• [x] When the button is clicked it should redirect to the associated alert (react-router-dom)