Revert token authentication

[chrisminett]

Revert the token authentication changes added in #19 , keeping the deprecation for getConfig().

Although this is essentially a BC break as it removes code, no implementation can have used token auth as it is not live in the Maxemail app.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.45%. Comparing base (af4fafb) to head (6bcb2bd).

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #21      +/-   ##
============================================
- Coverage     91.59%   91.45%   -0.15%     
+ Complexity       63       61       -2     
============================================
  Files             5        5              
  Lines           238      234       -4     
============================================
- Hits            218      214       -4     
  Misses           20       20              

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[chrisminett]

Checking that the token auth code has been correctly reverted:

• Compare this branch to immediately before Token authentication #19 , showing only the changes to deprecate getConfig(): 2560f04...revert-token-auth