Hide button

[polyccon]

Fixes: #107, #117, #165

• Added hide buttons on pages "about", "symptoms", "background", "additional info" and "appointments" to hide text areas.
• Added a test for the "send post" function, for when user enters invalid email".
• More file names in snake case for consistency across the app.

[codecov-io]

Codecov Report

Merging #198 into master will increase coverage by 0.01%. The diff coverage is 54.54%.

@@            Coverage Diff             @@
##           master     #198      +/-   ##
==========================================
+ Coverage   78.63%   78.65%   +0.01%     
==========================================
  Files          26       26              
  Lines         426      431       +5     
==========================================
+ Hits          335      339       +4     
- Misses         91       92       +1

Impacted Files	Coverage Δ
src/controllers/helpers/password_module.js	100% <ø> (ø)
src/controllers/about.js	55.55% <0%> (-11.12%)	:arrow_down:
src/controllers/appointments.js	68.42% <0%> (-8.05%)	:arrow_down:
src/controllers/signup.js	83.33% <100%> (ø)	:arrow_up:
src/controllers/login.js	89.47% <100%> (ø)	:arrow_up:
src/controllers/reset.js	37.83% <100%> (ø)	:arrow_up:
src/controllers/send.js	59.09% <0%> (+18.18%)	:arrow_up:

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