Branch fix website links

[urieltan]

Fix some of the links in index.md and SettingUp.md

[lerxcl]

I think you need to rename your PPP, it is missing ".md".
I put created an issue for it!

[codecov-io]

Codecov Report

Merging #240 (620dc9a) into master (3c3294d) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #240   +/-   ##
=========================================
  Coverage     67.18%   67.18%           
  Complexity      887      887           
=========================================
  Files           130      130           
  Lines          3020     3020           
  Branches        469      469           
=========================================
  Hits           2029     2029           
  Misses          783      783           
  Partials        208      208           

Impacted Files	Coverage Δ	Complexity Δ
...main/java/seedu/address/model/task/Recurrence.java	51.85% <0.00%> (ø)	10.00% <0.00%> (ø%)

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[lerxcl]

Thanks for making the changes, LGTM now! 👍