Fix issue with picture upload and rendering based on 4 modes how Obsidian can store images.

Add there option to view other files and uplod/download files from main view

md_viewer/static/highlight/styles/stackoverflow-light.min.css

@@ -0,0 +1,13 @@
+pre code.hljs{display:block;overflow-x:auto;padding:1em}code.hljs{padding:3px 5px}/*!
+  Theme: StackOverflow Light
+  Description: Light theme as used on stackoverflow.com
+  Author: stackoverflow.com
+  Maintainer: @Hirse
+  Website: https://github.com/StackExchange/Stacks
+  License: MIT
+  Updated: 2021-05-15
+
+  Updated for @stackoverflow/stacks v0.64.0
+  Code Blocks: /blob/v0.64.0/lib/css/components/_stacks-code-blocks.less
+  Colors: /blob/v0.64.0/lib/css/exports/_stacks-constants-colors.less
+*/.hljs{color:#2f3337;background:#f6f6f6}.hljs-subst{color:#2f3337}.hljs-comment{color:#656e77}.hljs-attr,.hljs-doctag,.hljs-keyword,.hljs-meta .hljs-keyword,.hljs-section,.hljs-selector-tag{color:#015692}.hljs-attribute{color:#803378}.hljs-name,.hljs-number,.hljs-quote,.hljs-selector-id,.hljs-template-tag,.hljs-type{color:#b75501}.hljs-selector-class{color:#015692}.hljs-link,.hljs-regexp,.hljs-selector-attr,.hljs-string,.hljs-symbol,.hljs-template-variable,.hljs-variable{color:#54790d}.hljs-meta,.hljs-selector-pseudo{color:#015692}.hljs-built_in,.hljs-literal,.hljs-title{color:#b75501}.hljs-bullet,.hljs-code{color:#535a60}.hljs-meta .hljs-string{color:#54790d}.hljs-deletion{color:#c02d2e}.hljs-addition{color:#2f6f44}.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:700}