docs: Rename main README to README.md

* Match the other doc files we maintain in Git under docs/ and
  for individual components, as well as all inline docs for PHP
  and JS documentation render as Markdown via JSDoc/JSDuck/Doxygen.

  This was currently the only prominent 'wikitext'-ish
  documentation file.
  Although the only wikitext-speficic syntax here was the heading.

* The current README was not shown at all in Gitiles as it requires
  the README to have a file extension, and it does not support
  '.mediawiki'.

Follows-up c0342da8e9a675.

Change-Id: I79e7e033690abe4de042969826964389ac57fcf6

4 files changed, 1 insertions, 4 deletions

diff --git a/.gitattributes b/.gitattributes
index 884befbf68d8..6e715317c576 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -7,7 +7,6 @@
 .* export-ignore
 *.htaccess -export-ignore
 package.json export-ignore
-README.mediawiki export-ignore
 Gemfile* export-ignore
 vendor/pear/net_smtp/README.rst export-ignore
 phpunit.xml.dist export-ignore
diff --git a/README b/README.md
index ad9b9d9d837a..12337e6d0737 100644
--- a/README
+++ b/README.md
@@ -1,4 +1,4 @@
-== MediaWiki ==
+# MediaWiki
 
 MediaWiki is a free and open-source wiki software package written in PHP. It
 serves as the platform for Wikipedia and the other Wikimedia projects, used
diff --git a/README.mediawiki b/README.mediawiki
deleted file mode 120000
index 100b93820ade..000000000000
--- a/README.mediawiki
+++ /dev/null
@@ -1 +0,0 @@
-README
\ No newline at end of file
diff --git a/tests/phpunit/documentation/ReleaseNotesTest.php b/tests/phpunit/documentation/ReleaseNotesTest.php
index 6976e604a606..efd8cbf1d572 100644
--- a/tests/phpunit/documentation/ReleaseNotesTest.php
+++ b/tests/phpunit/documentation/ReleaseNotesTest.php
@@ -42,7 +42,6 @@ class ReleaseNotesTest extends MediaWikiTestCase {
 			"FAQ",
 			"HISTORY",
 			"INSTALL",
-			"README",
 			"SECURITY",
 		];