Editorial updates

* Update link list without changing any links.
* Removed old, irrelevant text.

README.md

@@ -74,9 +74,6 @@ The Zonemaster Backend documentation is split up into several documents:
 * The [API](docs/API.md) documentation describes the *RPC API daemon* inteface in
   detail.
 
-The [docs](docs/) directory also contains the SQL commands for manipulating the
-database. 
-
 
 ## License
 
@@ -85,8 +82,8 @@ The software is released under the 2-clause BSD license. See separate
 
 
 [Configuration documentation]: docs/Configuration.md
-[installation instructions]: docs/Installation.md
-[Upgrade to 1.0.3]: docs/upgrade_db_zonemaster_backend_ver_1.0.3.md
-[Upgrade to 1.1.0]: docs/upgrade_db_zonemaster_backend_ver_1.1.0.md
-[Upgrade to 5.0.0]: docs/upgrade_db_zonemaster_backend_ver_5.0.0.md
-[Upgrade to 5.0.2]: docs/upgrade_db_zonemaster_backend_ver_5.0.2.md
+[Installation instructions]:   docs/Installation.md
+[Upgrade to 1.0.3]:            docs/upgrade_db_zonemaster_backend_ver_1.0.3.md
+[Upgrade to 1.1.0]:            docs/upgrade_db_zonemaster_backend_ver_1.1.0.md
+[Upgrade to 5.0.0]:            docs/upgrade_db_zonemaster_backend_ver_5.0.0.md
+[Upgrade to 5.0.2]:            docs/upgrade_db_zonemaster_backend_ver_5.0.2.md