docs: remove redundant targets

docs/auth.rst

@@ -23,8 +23,6 @@ for the `GW Open Science Center (GWOSC) <https://www.gwosc.org/>`__:
     https://datafind.gwosc.org
 
 
-.. _scitokens:
-
 =========
 SciTokens
 =========

docs/install.rst

@@ -4,8 +4,6 @@
 Installing GWDataFind
 #####################
 
-.. _conda:
-
 =====
 Conda
 =====
@@ -20,8 +18,6 @@ The recommended method of installing GWDataFind is with
 
     conda install -c conda-forge gwdatafind
 
-.. _debian:
-
 ======
 Debian
 ======
@@ -45,8 +41,6 @@ To install the Python 3 library only (and not any command-line entry points):
 
     apt-get install python3-gwdatafind
 
-.. _pip:
-
 ===
 Pip
 ===