Server-side syntax highlighting for all code (#12047)

* Server-side syntax hilighting for all code

This PR does a few things:

* Remove all traces of highlight.js
* Use chroma library to provide fast syntax hilighting directly on the server
* Provide syntax hilighting for diffs
* Re-style both unified and split diffs views
* Add custom syntax hilighting styling for both regular and arc-green

Fixes #7729
Fixes #10157
Fixes #11825
Fixes #7728
Fixes #3872
Fixes #3682

And perhaps gets closer to #9553

* fix line marker

* fix repo search

* Fix single line select

* properly load settings

* npm uninstall highlight.js

* review suggestion

* code review

* forgot to call function

* fix test

* Apply suggestions from code review

suggestions from @silverwind thanks

Co-authored-by: silverwind <me@silverwind.io>

* code review

* copy/paste error

* Use const for highlight size limit

* Update web_src/less/_repository.less

Co-authored-by: Lauris BH <lauris@nix.lv>

* update size limit to 1MB and other styling tweaks

* fix highlighting for certain diff sections

* fix test

* add worker back as suggested

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Lauris BH <lauris@nix.lv>

vendor/github.com/alecthomas/chroma/lexers/b/brainfuck.go

@@ -0,0 +1,34 @@
+package b
+
+import (
+	. "github.com/alecthomas/chroma" // nolint
+	"github.com/alecthomas/chroma/lexers/internal"
+)
+
+// Brainfuck lexer.
+var Brainfuck = internal.Register(MustNewLexer(
+	&Config{
+		Name:      "Brainfuck",
+		Aliases:   []string{"brainfuck", "bf"},
+		Filenames: []string{"*.bf", "*.b"},
+		MimeTypes: []string{"application/x-brainfuck"},
+	},
+	Rules{
+		"common": {
+			{`[.,]+`, NameTag, nil},
+			{`[+-]+`, NameBuiltin, nil},
+			{`[<>]+`, NameVariable, nil},
+			{`[^.,+\-<>\[\]]+`, Comment, nil},
+		},
+		"root": {
+			{`\[`, Keyword, Push("loop")},
+			{`\]`, Error, nil},
+			Include("common"),
+		},
+		"loop": {
+			{`\[`, Keyword, Push()},
+			{`\]`, Keyword, Pop(1)},
+			Include("common"),
+		},
+	},
+))