fix: enable Basemaps preview for Elevation data TDE-1151 BM-932 (#543)

#### Motivation

Enable the Basemaps configuration for `dem_lerc`, as Basemaps now
supports previewing Elevation data.

#### Modification

Remove exclusion for `dem_lerc` preset.

#### Checklist

- [ ] Tests updated N/A
- [x] Docs updated
- [x] Issue linked in Title

workflows/raster/README.md

@@ -121,9 +121,9 @@ graph TD;
     get-location-->standardise-validate;
     tileindex-validate-->standardise-validate;
     standardise-validate-->create-collection;
-    standardise-validate-.->|compression != dem_lerc|create-overview;
+    standardise-validate-->create-overview;
     create-collection-->stac-validate-.->|publish_to_odr == true|publish-odr;
-    create-overview-.->create-config-.->|publish_to_odr == true|publish-odr;
+    create-overview-.->|compression != dem_lerc|create-config-.->|publish_to_odr == true|publish-odr;
 ```
 
 ### [collection-id-setup](./standardising.yaml)

workflows/raster/standardising.yaml

@@ -386,7 +386,7 @@ spec:
             depends: 'standardise-validate'
 
           - name: create-config
-            when: "'{{workflow.parameters.target_epsg}}' =~ '2193|3857' && '{{workflow.parameters.compression}}' != 'dem_lerc'"
+            when: "'{{workflow.parameters.target_epsg}}' =~ '2193|3857'"
             arguments:
               parameters:
                 - name: location