Updating documentation main

[cvvergara]

Documentation

A revision of the documentation was performed on develop branch.
Porting that revision to 3.3.2 and adjusting to 3.3.2's functions.

• Revised documentation
  • Simplifying table names and table columns, for example:
    • edges instead of edge_table
      • Removing unused columns category_id and reverse_category_id.
    • combinations instead of combinations_table
    • Using PostGIS standard for geometry column.
      • geom instead of the_geom
  • Avoiding usage of functions that modify indexes, columns etc on tables.
    • Using pgr_extractVertices to create a routing topology
  • Restructure of the pgRouting concepts page.

The general looks of this documentation:
https://docs.pgrouting.org/dev/en/index.html
the pgRouting concepts page:
https://docs.pgrouting.org/dev/en/pgRouting-concepts.html

Translation was ported, but is not all processed because of fuzzy marks that need to be resolved with weblate.

@pgRouting/admins

[cvvergara]

Coday is not checking, (maybe because of so many differences)
So please ignore codacy checks.