Removing HTTPS support from code and tests

[joselsegura]

Description

Remove the support for HTTPS from configuration, implementation and tests that used it. Also deleting the certificates because it won't be used.

Fixes #48

Type of change

• Refactor (refactoring code, removing useless files)

Testing steps

Regular CI

[tisnik]

LGTM

[codecov-commenter]

Codecov Report

Merging #131 into master will decrease coverage by 0.20%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #131      +/-   ##
==========================================
- Coverage   74.47%   74.27%   -0.21%     
==========================================
  Files           9        9              
  Lines         384      381       -3     
==========================================
- Hits          286      283       -3     
  Misses         79       79              
  Partials       19       19              

Impacted Files	Coverage Δ
server/server.go	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update dca2ccd...14b4c19. Read the comment docs.