- added mkdocs yml link

- added GHS OBAT

Author: samapriya

mkdocs.yml

@@ -401,6 +401,7 @@ nav:
               - Global Google-Microsoft Open Buildings Dataset: projects/global_buildings.md
               - USA Structures: projects/usa_structures.md
               - GLObal Building heights for Urban Studies (UT-GLOBUS): projects/utglobus.md
+              - Global Human Settlement Open Buildings Attribute Table (GHS-OBAT): projects/ghs_obat.md
               - Global Electric Consumption revised GDP: projects/elc_gdp.md
               - Global Mining Areas and Validation Datasets: projects/global_mining.md
               - Global Healthsites Mapping Project: projects/health_sites.md