Remove "DEPRECATED" from rule names (act-rules#2118)

Author: WilcoFiers

_rules/html-page-lang-xml-lang-match-5b7ae0.md

@@ -1,6 +1,6 @@
 ---
 id: 5b7ae0
-name: DEPRECATED — HTML page lang and xml:lang attributes have matching values
+name: HTML page lang and xml:lang attributes have matching values
 rule_type: atomic
 description: |
   This rule checks that both `lang` and `xml:lang` attributes on the root element of a non-embedded HTML page, have the same primary language subtag.

_rules/image-filename-as-accessible-name-9eb3f6.md

@@ -1,6 +1,6 @@
 ---
 id: 9eb3f6
-name: DEPRECATED — Image filename is accessible name for image
+name: Image filename is accessible name for image
 rule_type: atomic
 description: |
   This rule checks that image elements that use their source filename as their accessible name do so without loss of information to the user.

_rules/video-description-track-f196ce.md

@@ -1,6 +1,6 @@
 ---
 id: f196ce
-name: DEPRECATED — Video element visual content has description track
+name: Video element visual content has description track
 rule_type: atomic
 description: |
   This rule checks that description tracks that come with non-streaming `video` elements are descriptive.

_rules/video-only-description-track-ac7dc6.md

@@ -1,6 +1,6 @@
 ---
 id: ac7dc6
-name: DEPRECATED — Video element visual-only content has description track
+name: Video element visual-only content has description track
 rule_type: atomic
 description: |
   This rule checks that description tracks that come with non-streaming `video` elements, without audio, are descriptive.