Delete graphofgraphs folder

Co-Authored-By: Pietro Monticone <38562595+pitmonticone@users.noreply.github.com>
Co-Authored-By: Claudio Moroni <43729990+ClaudMor@users.noreply.github.com>

Author: 3 people

docs/src/API.md

@@ -248,6 +248,13 @@ has_edge(mg::M, src::T, dst::T) where { T, M <: AbstractMultilayerDiGraph{T}}
 rem_edge!(mg::M, src::T, dst::T) where {T, M <: AbstractMultilayerGraph{T}
 ```
 
+### Representations
+```@docs
+AbstractTensorRepresentation{U}
+array(atr::AbstractTensorRepresentation)
+array(amr::AbstractMatrixRepresentation)
+```
+