[UI] Add ability to store user sessions (#27)

The are placed in StoredSessions folder 6-hex file names, links
are looking like this:
http://localhost:3000/1561c1

to achive this a major refactoring of the frontend was done, splitting
main page.js into session context and explorer content, also adding
session id instances of a unique page and route.

Author: MrSidims

.gitignore

@@ -44,3 +44,6 @@ yarn-error.log*
 # typescript
 *.tsbuildinfo
 next-env.d.ts
+
+# ignore stored sessions
+StoredSessions/*

StoredSessions/.gitkeep

@@ -0,0 +1 @@
+

package.json

@@ -3,11 +3,12 @@
   "version": "0.1.0",
   "private": true,
   "scripts": {
-    "dev": "next dev",
+    "dev:ui":  "next dev",
+    "dev:api": "./mlir_venv/bin/python -m uvicorn backend.server:app --host 0.0.0.0 --port 8000 --reload",
+    "start:all": "concurrently \"npm run dev:ui\" \"npm run dev:api\"",
     "build": "next build",
     "start": "next start",
-    "lint": "next lint",
-    "start:all": "concurrently \"npm run dev\" \"./mlir_venv/bin/python -m uvicorn backend.server:app --host 0.0.0.0 --port 8000 --reload\""
+    "lint": "next lint"
   },
   "dependencies": {
     "@monaco-editor/react": "^4.7.0",