added a flowchart for incorporating remediated headings

docs/remediated_subject_headings_flowchart.md

@@ -0,0 +1,10 @@
+```mermaid
+flowchart TD
+A[Do the authorities db setup] --> B[Get set of remdiated authorities]
+B --> C[Iterate over set of authorities]
+C --> D[Update subjects_xrefs table to replace \ndeprecated subject_id and xref_id to mmsid of new subject]
+C --> E[Add entry to subjects_xref with `subject_id`\n deprecated term, `xref_id` remediated mms_id with see_instead type]
+C --> F[Add entry to subjects with mms_id as the `id` ]
+
+G[In SolrDocument::Authority_Graph make loc_id handle non loc ids]
+```