Revert "Merge pull #793: Dev Docs: New Glossary & JS Search Box"

This reverts commit e3dcf0ce1f, reversing
changes made to c71e9fdf2d.

Once again we had a broken new plugin that Travis CI and local building
didn't catch.

_data/glossary/en/nbits.yaml

@@ -1,33 +0,0 @@
----
-# This file is licensed under the MIT License (MIT) available on
-# http://opensource.org/licenses/MIT.
-
-required:
-                                           #-------------40 characters-------------#
-    title_max_40_characters_no_formatting: nBits, Target Threshold
-
-    summary_max_255_characters_no_formatting: >
-        The target is the threshold below which a block header hash must
-        be in order for the block to valid, and nBits is the encoded
-        form of the target threshold as it appears in the block header.
-
-    synonyms_shown_in_glossary_capitalize_first_letter:
-        - nBits
-        - Target
-
-optional:
-    synonyms_and_pluralizations_not_shown_in_glossary:
-        - targets
-        - target threshold
-        - target thresholds
-
-    not_to_be_confused_with_capitalize_first_letter:
-        - Difficulty (a number measuring the difficulty of finding a header hash relative to the difficulty of finding a header hash with the easiest target)
-
-    links_html_or_markdown_style_capitalize_first_letter:
-        - "[Target](/en/developer-guide#term-target) --- Bitcoin.org Developer Guide"
-        - "[nBits](/en/developer-reference#target-nbits) --- Bitcoin.org Developer Reference"
-        - "[Target](https://en.bitcoin.it/wiki/Target) --- Bitcoin Wiki"
-        - "[How is the target section of the block header calculated?](http://bitcoin.stackexchange.com/q/23912) --- Bitcoin StackExchange"
-
----