feat: adding all tables to the docs

docs/tables/mpe_signoffs.md

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+---
+layout: article
+title: MPE_SIGNOFFS
+description: The MPE_SIGNOFFS table records signoffs made against loaded data in Data Controller for SAS®.
+---
+
+# MPE_SIGNOFFS
+
+The `MPE_SIGNOFFS` table is designed to record signoffs - the final approval step associated with SIGNOFF access (see [MPE_SECURITY](/tables/mpe_security/) and [SIGNOFF_COLS](/dcc-tables/#signoff_cols)).
+
+!!! note
+    This table is created as part of the Data Controller data model but is not currently populated by any Data Controller service. It is reserved for custom signoff implementations.
+
+## Columns
+
+ - 🔑 `TECH_FROM_DTTM num`: SCD2 open datetime
+ - 🔑 `SIGNOFF_TABLE char(50)`: The table being signed off
+ - 🔑 `SIGNOFF_SECTION_RK num`: The retained key of the section being signed off
+ - `SIGNOFF_VERSION_RK num`: The retained key of the version being signed off
+ - `SIGNOFF_NAME char(100)`: The name of the user performing the signoff
+ - `TECH_TO_DTTM num`: SCD2 close datetime