update user schema to include new fields and ability to updateUser

[thinknoack]

This contains the editing feature for user content on the about page. It also adds the hasEdit, loggedIn, and admin checks.

[codecov]

Codecov Report

Attention: Patch coverage is 74.18182% with 71 lines in your changes missing coverage. Please review.

Project coverage is 47.01%. Comparing base (ec2c84b) to head (a4ef889).
Report is 32 commits behind head on master.

Files with missing lines	Patch %	Lines
...ges/openneuro-server/src/graphql/resolvers/user.ts	13.88%	31 Missing ⚠️
packages/openneuro-app/src/scripts/routes.tsx	0.00%	16 Missing ⚠️
...o-app/src/scripts/users/components/edit-string.tsx	82.00%	9 Missing ⚠️
packages/openneuro-server/src/graphql/schema.ts	0.00%	6 Missing ⚠️
...uro-app/src/scripts/users/components/edit-list.tsx	81.48%	5 Missing ⚠️
.../src/scripts/users/components/editable-content.tsx	93.33%	2 Missing ⚠️
...openneuro-server/src/graphql/resolvers/mutation.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3272      +/-   ##
==========================================
+ Coverage   46.67%   47.01%   +0.33%     
==========================================
  Files         609      609              
  Lines       38739    38971     +232     
  Branches     1232     1253      +21     
==========================================
+ Hits        18083    18321     +238     
+ Misses      20461    20455       -6     
  Partials      195      195              

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[nellh]

Tested locally with several kinds of users and it looks like it's in a pretty good state.