Added ability to use custom favicon (#202)

* Added ability to change favicon in config

* Turned back version of icon in index.twig

* Added opportunity to upload favicon and route to get saved favicon

* Removed favicon from .codexdocsrc.sample

* Added docs to favicon route

* Replaced uploadFavicon to initiating /favicon route, updated function, added catching errors from uploadFile

* Updated Readme, added info about setting up app

* Updated Readme.md

* Some changes

* Favicon data saves to app.locals, replaced uploading favicon to app.ts

* Changed naming in config, from faviconURL to favicon, changed using app.locals variables

* Renamed uploadFavicon to downLoadFavicon, removed log in locals.ts

* Renamed favicon variable in app.ts

* Added checking favicon before uploading function, removed passing locals to views

* Added timeout for uploading favicon request and writeFileSync changed to writeFile

* Removed passing favicon locals and turned back removed variables

* Turned back variables

* Fixed duplicating os.tmpdir

* Fixed braces in objects, added new lines

* Added default favicon path, if favicon does not exists in config

* Updated docs, fixed using local favicon

config/development.json

@@ -3,5 +3,6 @@
   "database": ".db",
   "rcFile": "./.codexdocsrc",
   "uploads": "public/uploads",
-  "secret": "iamasecretstring"
+  "secret": "iamasecretstring",
+  "favicon": ""
 }