Add plain text grammer and atom light

theme/highlight.css

@@ -1 +1 @@
-pre code.hljs{display:block;overflow-x:auto;padding:1em}code.hljs{padding:3px 5px}.hljs{color:#abb2bf;background:#282c34}.hljs-keyword,.hljs-operator,.hljs-pattern-match{color:#f92672}.hljs-function,.hljs-pattern-match .hljs-constructor{color:#61aeee}.hljs-function .hljs-params{color:#a6e22e}.hljs-function .hljs-params .hljs-typing{color:#fd971f}.hljs-module-access .hljs-module{color:#7e57c2}.hljs-constructor{color:#e2b93d}.hljs-constructor .hljs-string{color:#9ccc65}.hljs-comment,.hljs-quote{color:#b18eb1;font-style:italic}.hljs-doctag,.hljs-formula{color:#c678dd}.hljs-deletion,.hljs-name,.hljs-section,.hljs-selector-tag,.hljs-subst{color:#e06c75}.hljs-literal{color:#56b6c2}.hljs-addition,.hljs-attribute,.hljs-meta .hljs-string,.hljs-regexp,.hljs-string{color:#98c379}.hljs-built_in,.hljs-class .hljs-title,.hljs-title.class_{color:#e6c07b}.hljs-attr,.hljs-number,.hljs-selector-attr,.hljs-selector-class,.hljs-selector-pseudo,.hljs-template-variable,.hljs-type,.hljs-variable{color:#d19a66}.hljs-bullet,.hljs-link,.hljs-meta,.hljs-selector-id,.hljs-symbol,.hljs-title{color:#61aeee}.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:700}.hljs-link{text-decoration:underline}
+pre code.hljs{display:block;overflow-x:auto;padding:1em}code.hljs{padding:3px 5px}.hljs{color:#383a42;background:#fafafa}.hljs-comment,.hljs-quote{color:#a0a1a7;font-style:italic}.hljs-doctag,.hljs-formula,.hljs-keyword{color:#a626a4}.hljs-deletion,.hljs-name,.hljs-section,.hljs-selector-tag,.hljs-subst{color:#e45649}.hljs-literal{color:#0184bb}.hljs-addition,.hljs-attribute,.hljs-meta .hljs-string,.hljs-regexp,.hljs-string{color:#50a14f}.hljs-attr,.hljs-number,.hljs-selector-attr,.hljs-selector-class,.hljs-selector-pseudo,.hljs-template-variable,.hljs-type,.hljs-variable{color:#986801}.hljs-bullet,.hljs-link,.hljs-meta,.hljs-selector-id,.hljs-symbol,.hljs-title{color:#4078f2}.hljs-built_in,.hljs-class .hljs-title,.hljs-title.class_{color:#c18401}.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:700}.hljs-link{text-decoration:underline}

theme/highlight.js

@@ -371,7 +371,14 @@ className:"",begin:/\\"/},{className:"string",begin:/'/,end:/'/},t]}}})()
 (()=>{var s=(()=>{"use strict";return s=>({name:"Shell Session",
 aliases:["console","shellsession"],contains:[{className:"meta.prompt",
 begin:/^\s{0,3}[/~\w\d[\]()@-]*[>%$#][ ]?/,starts:{end:/[^\\](?=\s*$)/,
-subLanguage:"bash"}}]})})();hljs.registerLanguage("shell",s)})();/*! `ruby` grammar compiled for Highlight.js 11.6.0 */
+subLanguage:"bash"}}]})})();hljs.registerLanguage("shell",s)})();/*! `plaintext` grammar compiled for Highlight.js 11.6.0 */
+(()=>{var t=(()=>{"use strict";return t=>({name:"Plain text",
+aliases:["text","txt"],disableAutodetect:!0})})()
+;hljs.registerLanguage("plaintext",t)})();/*! `python-repl` grammar compiled for Highlight.js 11.6.0 */
+(()=>{var a=(()=>{"use strict";return a=>({aliases:["pycon"],contains:[{
+className:"meta.prompt",starts:{end:/ |$/,starts:{end:"$",subLanguage:"python"}
+},variants:[{begin:/^>>>(?=[ ]|$)/},{begin:/^\.\.\.(?=[ ]|$)/}]}]})})()
+;hljs.registerLanguage("python-repl",a)})();/*! `ruby` grammar compiled for Highlight.js 11.6.0 */
 (()=>{var e=(()=>{"use strict";return e=>{
 const n=e.regex,a="([a-zA-Z_]\\w*[!?=]?|[-+~]@|<<|>>|=~|===?|<=>|[<>]=?|\\*\\*|[-/+%^&*~`|]|\\[\\]=?)",s=n.either(/\b([A-Z]+[a-z0-9]+)+/,/\b([A-Z]+[a-z0-9]+)+[A-Z]+/),i=n.concat(s,/(::\w+)*/),r={
 "variable.constant":["__FILE__","__LINE__"],
@@ -445,11 +452,7 @@ className:"number",
 begin:"\\b[0-9]{4}(-[0-9][0-9]){0,2}([Tt \\t][0-9][0-9]?(:[0-9][0-9]){2})?(\\.[0-9]*)?([ \\t])*(Z|[-+][0-9][0-9]?(:[0-9][0-9])?)?\\b"
 },{className:"number",begin:e.C_NUMBER_RE+"\\b",relevance:0},t,g,s],r=[...b]
 ;return r.pop(),r.push(i),l.contains=r,{name:"YAML",case_insensitive:!0,
-aliases:["yml"],contains:b}}})();hljs.registerLanguage("yaml",e)})();/*! `python-repl` grammar compiled for Highlight.js 11.6.0 */
+aliases:["yml"],contains:b}}})();hljs.registerLanguage("yaml",e)})();/*! `lua` grammar compiled for Highlight.js 11.6.0 */
-(()=>{var a=(()=>{"use strict";return a=>({aliases:["pycon"],contains:[{
-className:"meta.prompt",starts:{end:/ |$/,starts:{end:"$",subLanguage:"python"}
-},variants:[{begin:/^>>>(?=[ ]|$)/},{begin:/^\.\.\.(?=[ ]|$)/}]}]})})()
-;hljs.registerLanguage("python-repl",a)})();/*! `lua` grammar compiled for Highlight.js 11.6.0 */
 (()=>{var e=(()=>{"use strict";return e=>{const t="\\[=*\\[",a="\\]=*\\]",n={
 begin:t,end:a,contains:["self"]
 },o=[e.COMMENT("--(?!\\[=*\\[)","$"),e.COMMENT("--\\[=*\\[",a,{contains:[n],