Tweak HTML indents and highlights

crates/zed/src/languages/html/highlights.scm

@@ -1,11 +1,15 @@
 (tag_name) @keyword
+(erroneous_end_tag_name) @keyword
 (doctype) @constant
 (attribute_name) @property
 (attribute_value) @string
 (comment) @comment
 
+"=" @operator
+
 [
   "<"
   ">"
   "</"
+  "/>"
 ] @punctuation.bracket

crates/zed/src/languages/html/indents.scm

@@ -1 +1,6 @@
-(tag_name) @indent
+(start_tag ">" @end) @indent
+(self_closing_tag "/>" @end) @indent
+
+(element
+  (start_tag) @start
+  (end_tag)? @end) @indent

crates/zed/src/languages/html/injections.scm

@@ -1,4 +1,3 @@
 (script_element
     (raw_text) @content
     (#set! "language" "javascript"))
-