Temporarily remove SQLA implementation of sds5db.

Fixes #29.

CHANGELOG.rst

@@ -12,6 +12,7 @@ This document records the main changes to the ``sdssdb`` code.
 * New tools for table `ingestion <.ingest>`.
 * New tools for database `maintenance/internals <.internals>`.
 * Add `.PeeweeDatabaseConnection.get_model` to retrieve the model for a given table.
+* :bug:`28` Temporarily remove SQLAlchemy implementation of ``sds5db`` since it's not maintained. We may reintroduce it later once the schema is stable.
 
 * :release:`0.3.2 <2020-03-10>`
 * Change ``operations-test`` profile to ``operations`` using the new machine hostname.

docs/sphinx/intro.rst

@@ -113,14 +113,14 @@ Note that the level of readiness is not necessarily identical in both Peewee and
             <td class="active">sdss5db</td>
             <td class="active">catalogdb</td>
             <td class="success"></td>
-            <td class="warning"></td>
+            <td class="danger"></td>
             <td align="center"><a class="glyphicon glyphicon-download-alt" href="https://github.com/sdss/sdssdb/raw/master/schema/sdss5db/catalogdb/sdss5db.catalogdb.pdf" alt="catalogdb full version"></a> <a class="glyphicon glyphicon-download-alt" style="color:green" href="https://github.com/sdss/sdssdb/raw/master/schema/sdss5db/catalogdb/sdss5db.catalogdb_lite.pdf" alt="catalogdb reduced version"></td>
         </tr>
         <tr>
             <td></td>
             <td class="active">targetdb</td>
             <td class="success"></td>
-            <td class="success"></td>
+            <td class="danger"></td>
             <td align="center"><a class="glyphicon glyphicon-download-alt" href="https://github.com/sdss/sdssdb/raw/master/schema/sdss5db/targetdb/sdss5db.targetdb.pdf"></a></td>
         </tr>
         <tr>