Merge #574: Replace untranslated content with redirects

ef1e936 Replace untranslated content with redirects (David A. Harding)

Pull request description:

  We have a couple pages in non-English categories that just mirror the English text.  This likely confuses users (who would expect to find a Traditional Chinese page under a zh_TW URL) and adds extra work for contributors changing the English source page.

  This PR removes the untranslated content and redirects its URLs to the currently-identical English-language pages.  I locally tested the redirects.

Tree-SHA512: 39f263e0e7d16dda669f99d5ca7269c34b1de6df53c3c2277d32fa9c2ad6f6cdb71033603e35f3a39203810963fb2cd99ca267d53f67b66110eb0fec4e4b1b47

Author: harding

_posts/en/pages/2016-01-01-about.md

@@ -7,6 +7,8 @@ layout: page
 lang: en
 share: false
 version: 1
+redirect_from:
+  - /zh_TW/about/
 ---
 
 Bitcoin Core is an [open source](https://opensource.org/) project which maintains and releases Bitcoin client software called "Bitcoin Core".
@@ -15,4 +17,4 @@ It is a direct descendant of the original Bitcoin software client released by Sa
 
 Bitcoin Core consists of both "full-node" software for fully validating the blockchain as well as a bitcoin wallet. The project also currently maintains related software such as the cryptography library [libsecp256k1](https://github.com/bitcoin/secp256k1) and others located at [GitHub](https://github.com/bitcoin).
 
-Anyone can [contribute to Bitcoin Core](/en/contribute/).
+Anyone can [contribute to Bitcoin Core](/en/contribute/).

_posts/en/pages/2016-01-01-contribute.md

@@ -8,6 +8,8 @@ layout: page
 lang: en
 share: false
 version: 3
+redirect_from:
+  - /zh_TW/contribute/
 ---
 
 You are welcome to contribute to the project!
@@ -35,4 +37,4 @@ You can also translate or contribute to this [website][website-contrib].
 [translation_process.md]: https://github.com/bitcoin/bitcoin/blob/master/doc/translation_process.md
 [website-contrib]: https://github.com/bitcoin-core/bitcoincore.org/blob/master/CONTRIBUTING.md
 
-{% include references.md %}
+{% include references.md %}