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/op-code.yaml

@@ -1,34 +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: Op Code
-
-    summary_max_255_characters_no_formatting: >
-        Operation codes from the Bitcoin Script language which push data
-        or perform functions within a pubkey script or signature script.
-
-    synonyms_shown_in_glossary_capitalize_first_letter:
-        - Op code
-        - Data-pushing op code
-        - Non-data-pushing op code
-
-optional:
-    synonyms_and_pluralizations_not_shown_in_glossary:
-        - op codes
-        - opcode
-        - opcodes
-        - data-pushing op codes
-        - data-pushing opcodes
-        - non-data-pushing op codes
-        - non-data-pushing opcodes
-
-    not_to_be_confused_with_capitalize_first_letter:
-
-    links_html_or_markdown_style_capitalize_first_letter:
-        - "[Op codes](/en/developer-reference#op-codes) --- Bitcoin.org Developer Reference"
-        - "[List of op codes](https://en.bitcoin.it/wiki/Script) --- Bitcoin Wiki"
-
----