Redirect on login Closes #1031

[JasirZaeem]

Closes #1031

Changes

Add next query param to /login page

Links to login page can now be of the form /login?next=further-path if the next param is present in the query, the user will be redirected to /further-path on successful login.

Fix redirection from /review/[lesson]

Logged out users who visit a review page will be redirected to the login page with the correct next parameter so that they are redirected back to this page on successful login.

[vercel]

@JasirZaeem is attempting to deploy a commit to a Personal Account owned by @garageScript on Vercel.

@garageScript first needs to authorize it.

[codecov]

Codecov Report

Merging #1033 (cc5893c) into master (7a6a2e4) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #1033   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          123       123           
  Lines         1994      1995    +1     
  Branches       484       485    +1     
=========================================
+ Hits          1994      1995    +1     

Impacted Files	Coverage Δ
pages/login.tsx	100.00% <100.00%> (ø)
pages/review/[lesson].tsx	100.00% <100.00%> (ø)

[vercel]

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