adapt broken links

README.Rmd

@@ -23,7 +23,7 @@ library(knitr)
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.8043597.svg)](https://doi.org/10.5281/zenodo.8043597)
 
 [![R-CMD-check](https://github.com/luckinet/ontologics/workflows/R-CMD-check/badge.svg)](https://github.com/luckinet/ontologics/actions)
-[![codecov](https://codecov.io/gh/luckinet/ontologics/branch/master/graph/badge.svg?token=hjppymcGr3)](https://codecov.io/gh/luckinet/ontologics)
+[![codecov](https://codecov.io/gh/luckinet/ontologics/branch/master/graph/badge.svg?token=hjppymcGr3)](https://app.codecov.io/gh/luckinet/ontologics)
 [![Lifecycle: experimental](https://img.shields.io/badge/lifecycle-experimental-orange.svg)](https://lifecycle.r-lib.org/articles/stages.html#experimental)
 
 [![](http://cranlogs.r-pkg.org/badges/grand-total/ontologics)](https://cran.r-project.org/package=ontologics)

vignettes/conversion_to_rdf.Rmd

@@ -132,7 +132,7 @@ Of course, in reality things are a little more complicated. Looking at the pseud
 <!-- TODO: (or rather possibly interesting) XKOS -->
 ## SKOS
 
-SKOS is shorthand for [Simple Knowledge Organization System](https://www.w3.org/TR/skos-primer/). It is a lightweight RDF vocabulary that can be used to express knowledge organisation systems (KOS) as RDF and thus make them interoperable with the Semantic Web. Popular KOS, such as [FAO Agrovoc](https://agrovoc.uniroma2.it/agrovoc/agrovoc/en/) or the [UNESCO Thesaurus](https://vocabularies.unesco.org/browser/thesaurus/en/) are expressed with SKOS.
+SKOS is shorthand for [Simple Knowledge Organization System](https://www.w3.org/TR/skos-primer/). It is a lightweight RDF vocabulary that can be used to express knowledge organisation systems (KOS) as RDF and thus make them interoperable with the Semantic Web. Popular KOS, such as [FAO Agrovoc](https://agrovoc.fao.org/agrovoc/agrovoc/en/) or the [UNESCO Thesaurus](https://vocabularies.unesco.org/browser/thesaurus/en/) are expressed with SKOS.
 
 We'll now try to give a short introduction to the parts of SKOS that we use in this package; please also visit the [SKOS reference page](https://www.w3.org/TR/skos-reference/). It is assumed that the [ontology database description](ontology_database_description.html) document was read. From the SKOS vocabulary, we mainly use the [**semantic relations**](https://www.w3.org/TR/skos-reference/#semantic-relations) and the [**mapping properties**](https://www.w3.org/TR/skos-reference/#mapping).