Revert "MAINT: drop BIOM v1.0.0 (qiime2#427)"

This reverts commit 3e0bf80.

Author: thermokarst

source/tutorials/importing.rst

@@ -359,8 +359,25 @@ BIOM v1.0.0
 Format description
 ******************
 
-This format must first be `converted`_ to BIOM v2.1.0 format before importing
-into QIIME 2. See the `BIOM v1.0.0 format specification`_ for details.
+See the `BIOM v1.0.0 format specification`_ for details.
+
+Obtaining example data
+``````````````````````
+
+.. download::
+   :url: https://data.qiime2.org/2019.7/tutorials/importing/feature-table-v100.biom
+   :saveas: feature-table-v100.biom
+
+Importing data
+**************
+
+.. command-block::
+
+   qiime tools import \
+     --input-path feature-table-v100.biom \
+     --type 'FeatureTable[Frequency]' \
+     --input-format BIOMV100Format \
+     --output-path feature-table-1.qza
 
 BIOM v2.1.0
 ~~~~~~~~~~~
@@ -442,8 +459,6 @@ If you have any questions, please post to the `QIIME 2 Forum`_ for help!
 
 .. _QIIME 2 Forum: https://forum.qiime2.org
 
-.. _converted: http://biom-format.org/documentation/biom_conversion.html
-
 .. _BIOM v1.0.0 format specification: http://biom-format.org/documentation/format_versions/biom-1.0.html
 
 .. _BIOM v2.1.0 format specification: http://biom-format.org/documentation/format_versions/biom-2.1.html