feat: adding all tables to the docs

docs/tables/mpe_selectbox.md

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+---
+layout: article
+title: MPE_SELECTBOX
+description: The MPE_SELECTBOX table configures the dropdown values available for columns of control tables in Data Controller for SAS®.
+---
+
+# MPE_SELECTBOX
+
+The `MPE_SELECTBOX` table configures the values that appear in dropdowns when editing control tables (eg `LOADTYPE` in [MPE_TABLES](/tables/mpe_tables/) or `ACCESS_LEVEL` in [MPE_SECURITY](/tables/mpe_security/)).
+
+A more detailed breakdown is available in the [configuration](/dcc-selectbox/) section.
+
+## Columns
+
+ - `VER_FROM_DTTM num`: SCD2 open datetime
+ - 🔑 `SELECTBOX_RK num`: Surrogate key for the selectbox value
+ - `SELECT_LIB char(17)`: Libref of the table to which the dropdown applies
+ - `SELECT_DS char(32)`: Name of the table to which the dropdown applies
+ - `BASE_COLUMN char(36)`: The column against which the dropdown is applied
+ - `SELECTBOX_VALUE char(500)`: The dropdown value
+ - `SELECTBOX_ORDER num`: Optional ordering of the dropdown values (1 comes before 2)
+ - `SELECTBOX_TYPE char(32)`: Column type (blank for default, else `sas` or `js` to indicate relevant system functions)
+ - `VER_TO_DTTM num`: SCD2 close datetime