Add overview of the graph API

docs/apis/graph-api/get-single-entities.md

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+# Get single entities
+

docs/apis/graph-api/overview.md

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+# Graph API
+
+The OpenAIRE Graph API provides a comprehensive way for developers to explore the [OpenAIRE Graph](https://graph.openaire.eu/), a vast interconnected dataset that aggregates metadata from a wide range of scholarly resources. 
+The Graph API offers endpoints for accessing and querying this interconnected dataset, enabling users to retrieve detailed information on research products, organizations, data sources, and projects. 
+
+You can access the Swagger documentation of the Graph API [here](https://openaire-api.athenarc.gr/swagger-ui/index.html#/).
+
+
+Please note that the Graph API: 
+
+- is intended for data discovery and exploration; if you are interested in downloading the full OpenAIRE Graph dataset, please navigate [here](../../downloads/full-graph).
+- adhers to the [terms of use](../terms.md) of the OpenAIRE public APIs - certain (rate limit) restrictions apply.
+
+## Learn more
+
+Please use the following links to learn more about the Graph API:
+
+- [Get single entities](./get-single-entities) - Retrieve detailed information on a single entity.
+- [Search entities](./search-entities/overview) - Retrieve a list of entities based on specific search criteria.
+    - [Filter search results](./search-entities/filter-search-results) - Filter search results based on specific criteria.
+    - [Sort search results](./search-entities/sort-search-results) - Sort search results based on specific criteria.
+    - [Pagination](./search-entities/pagination) - Retrieve a subset of search results. 

docs/apis/graph-api/search-entities/filter-search-results.md

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+# Filter search results
+

docs/apis/graph-api/search-entities/overview.md

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+# Search entities

docs/apis/graph-api/search-entities/pagination.md

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+# Pagination

docs/apis/graph-api/search-entities/sort-search-results.md

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+# Sort search results

docs/apis/home.md

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 # Public APIs
 
 The OpenAIRE Graph data are accessible through various public APIs. More specifically, the following APIs are currently provided:
-* [Search API](./search-api/search-api.md) (an API to search for research products and projects)
-* [ScholeXplorer API](https://api.scholexplorer.openaire.eu/swagger-ui/index.html?urls.primaryName=Scholexplorer%20API%20V2.0) (an API offering dataset-publication & dataset-dataset links)
-* [DSpace & EPrints API](./dspace-eprints-api.md) (an API to offer custom access to metadata for projects funded by a selection of international funders for DSpace and EPrints platforms)
-* [Broker API](./broker-api.md) (an API to enrich metadata for repositories, publishers, and aggregators) 
+* [Graph API](./graph-api/overview) - an API to explore the OpenAIRE Graph
+* [Search API](./search-api/search-api.md) - an API to search for research products and projects
+* [ScholeXplorer API](https://api.scholexplorer.openaire.eu/swagger-ui/index.html?urls.primaryName=Scholexplorer%20API%20V2.0) - an API offering dataset-publication & dataset-dataset links
+* [DSpace & EPrints API](./dspace-eprints-api.md) - an API to offer custom access to metadata for projects funded by a selection of international funders for DSpace and EPrints platforms
+* [Broker API](./broker-api.md) - an API to enrich metadata for repositories, publishers, and aggregators
 
 It is also worth mentioning that, between 2015 and 2023 a LOD API was being provided but the respective service has been discontinued. Old LOD datasets can be found on Zenodo [here](https://zenodo.org/records/4587369). 

sidebars.js

@@ -58,6 +58,24 @@ const sidebars = {
       label: "Public APIs",
       link: {type: 'doc', id: 'apis/home'},
       items: [
+        {
+          type: 'category', 
+          label: "Graph API",
+          link: { type: 'doc', id: 'apis/graph-api/overview' },
+          items: [
+            { type: 'doc', id: 'apis/graph-api/get-single-entities' },
+            {
+              type: 'category',
+                label: "Search entities",
+                link: { type: 'doc', id: 'apis/graph-api/search-entities/overview' },
+                items: [
+                  { type: 'doc', id: 'apis/graph-api/search-entities/filter-search-results' },
+                  { type: 'doc', id: 'apis/graph-api/search-entities/sort-search-results' },
+                  { type: 'doc', id: 'apis/graph-api/search-entities/pagination' },
+                ]
+              }
+          ]
+        },
         {
           type: 'category', 
           label: "Search API",