Auto merge of #15116 - Veykril:remove-markdown-injection, r=Veykril

Remove markdown injection again

I really tried to make this work, but this stuff is so underdocumented and basically none of the regex options worked for me (not `match`, nor using `begin` and `end` pairs), VSCode basically doesn't help you out at all as it doesn't ever seem to report errors even when debugging an extension, so at this point I'm inclined to just remove this again, as it is only causing issues.

Closes #15114
Closes #15111

Author: bors

editors/code/.vscodeignore

@@ -10,6 +10,5 @@
 !package-lock.json
 !package.json
 !ra_syntax_tree.tmGrammar.json
-!rustdoc.markdown.injection.tmGrammar.json
 !server
 !README.md

editors/code/package.json

@@ -1646,16 +1646,6 @@
                 "language": "ra_syntax_tree",
                 "scopeName": "source.ra_syntax_tree",
                 "path": "ra_syntax_tree.tmGrammar.json"
-            },
-            {
-                "scopeName": "source.rustdoc.markdown.injection",
-                "path": "rustdoc.markdown.injection.tmGrammar.json",
-                "injectTo": [
-                    "source.rust"
-                ],
-                "embeddedLanguages": {
-                    "meta.embedded.block.markdown": "text.html.markdown"
-                }
             }
         ],
         "problemMatchers": [