Restructure membership section #290

Place the PayPal link under the Online section.
Remove the part about MathSoc waiving fees (since we don't know if that will happen yet).

 For this online term (Spring 2021), you do not need to pay the $2 fee to renew your
 membership. We have extended the memberships of all members who had already
 previously paid for membership or have joined CS Club during an online term.
 Use the PayPayl link above to renew your membership for as many terms

     <button size="small" name="submit">Renew by PayPal</button>
   </form>
 </p>
 Just drop by the office with $2 for each term which you wish to renew.