Add version related tags

- Docs URL points to correct documentation version
- Display if we are in "development" version

InvenTree/part/templatetags/inventree_extras.py

@@ -136,6 +136,21 @@ def inventree_version(*args, **kwargs):
     return version.inventreeVersion()
 
 
+@register.simple_tag()
+def inventree_is_development(*args, **kwargs):
+    return version.isInvenTreeDevelopmentVersion()
+
+
+@register.simple_tag()
+def inventree_is_release(*args, **kwargs):
+    return not version.isInvenTreeDevelopmentVersion()
+
+
+@register.simple_tag()
+def inventree_docs_version(*args, **kwargs):
+    return version.inventreeDocsVersion()
+
+
 @register.simple_tag()
 def inventree_api_version(*args, **kwargs):
     """ Return InvenTree API version """
@@ -169,7 +184,10 @@ def inventree_github_url(*args, **kwargs):
 @register.simple_tag()
 def inventree_docs_url(*args, **kwargs):
     """ Return URL for InvenTree documenation site """
-    return "https://inventree.readthedocs.io/"
+
+    tag = version.inventreeDocsVersion()
+
+    return f"https://inventree.readthedocs.io/en/{tag}"
 
 
 @register.simple_tag()