Refactor/RenamingClasses

[JavierMonton]

This PR aims to rename a few classes to:

• Make them more understable
• Add a complete guide on how to create a new type
• Links .md files and expose them in GitHub Pages

[codecov]

Codecov Report

Merging #47 (b7b0f72) into main (9916cad) will decrease coverage by 23.39%.
The diff coverage is 48.88%.

@@             Coverage Diff              @@
##              main      #47       +/-   ##
============================================
- Coverage   100.00%   76.60%   -23.40%     
============================================
  Files           11       11               
  Lines          171      171               
  Branches         5        4        -1     
============================================
- Hits           171      131       -40     
- Misses           0       40       +40     

Flag	Coverage Δ
unittests	76.60% <48.88%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...tools/bigdatatypes/spark/SparkTypeConversion.scala	100.00% <ø> (ø)
...ls/bigdatatypes/bigquery/BigQueryDefinitions.scala	21.05% <7.69%> (-78.95%)	⬇️
...atatools/bigdatatypes/bigquery/BigQueryTable.scala	24.24% <8.33%> (-75.76%)	⬇️
.../bigdatatypes/bigquery/SqlInstanceToBigQuery.scala	100.00% <100.00%> (ø)
...ools/bigdatatypes/bigquery/SqlTypeToBigQuery.scala	100.00% <100.00%> (ø)
...rg/datatools/bigdatatypes/spark/SparkSchemas.scala	100.00% <100.00%> (ø)
.../datatools/bigdatatypes/spark/SqlTypeToSpark.scala	100.00% <100.00%> (ø)

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