Markdown editor (#92)

* Markdown editor

* use nocookie YT iframes

Co-authored-by: Emma Alexia Triphora <emma@modrinth.com>

* Fix line prefix-related Markdown editor bugs and add auto-lists

* Fix a couple codeblock issues

* address SearchFilter composition

* standardize code and patternize editor

* make editor typesafe

* adjust imports

* simplify key press handler

* Codemirror markdown implementation (#106)

* demo

* custom newline logic

* basic editor styling and buttons

* propogate styles

* validate and command structure for modals

* mobile safari event fix

* remove url field causing remount

* browser & mobile fix for link insertion

* override event passthrough to fix mobile

* fix modal state & disallow invalid url submission

* override paste behavior

* remove block flag in favor of newline insert

* cleanup before pr

* emit value from editor

* remove "a"

---------

Co-authored-by: Emma Alexia Triphora <emma@modrinth.com>
Co-authored-by: Carter <safe@fea.st>

lib/assets/styles/classes.scss

@@ -1014,6 +1014,7 @@ a,
   video {
     aspect-ratio: 16 / 9;
     width: 850px;
+    max-width: 100%;
     height: auto;
   }