Add missing documentation links.

There was no link anywhere to get to the documentation for the `import`
and `obsolete-replace` commands.

Author: gouttegd

src/site/markdown/index.md

@@ -14,10 +14,14 @@ Currently, the ODK ROBOT plugin provides the following commands:
 * [odk:subset](subset.html), to create ontology subsets;
 * [odk:check-align](alignment.html), to check the alignment of an
   ontology against an upper-level ontology and/or arbitrary root terms;
+* `odk:check` (documentation TBD), to perform other various checks on an
+  ontology;
 * [odk:normalize](normalize.html), to perform various normalisation
   operations on an ontology;
 * [odk:import](import.html), to add or remove import declarations in an
   ontology.
+* [odk:obsolete-replace](obsolete-replace.html), to obsolete an entity
+  replace all its usages with another entity.
 
 Using with the ODK
 ------------------
@@ -48,4 +52,4 @@ The ODK ROBOT plugin is distributed under the same terms as the Ontology
 Development Kit itself (3-clause BSD license). See the [COPYING
 file](https://github.com/INCATools/odk-robot-plugin/blob/main/COPYING)
 in the source distribution.
-  
+  

src/site/site.xml

@@ -12,6 +12,8 @@
       <item name="subset" href="subset.html" />
       <item name="check-align" href="alignment.html" />
       <item name="normalize" href="normalize.html" />
+      <item name="import" href="import.html "/>
+      <item name="obsolete-replace" href="obsolete-replace.html" />
     </menu>
     <menu name="Links">
       <item name="Issue tracker" href="https://github.com/INCATools/odk-robot-plugin/issues" />