ref: Add embded rust and router

- Use embed rust to load and resolve file from `content/post` folder, so
the whole process is a bit more dynamic.

- Add router to to resolve the path. It is the first step to try to get
the code a bit cleaner.

fix: Pick a broader address bind

Trying to fixe the following issue from Heroku:

> Error R10 (Boot timeout) -> Web process failed to bind to $PORT
> within 60 seconds of launch

fix: Change process type

Change heroku procfile process type to web so the process can receive
http requet through  `POST` envvar.

feat: Add heroku Procfile

feat: Add port env var

Now the port can be set through `PORT` enviroment variable, this is
useful for deploying on heroku.

fix: Update .gitlab-ci.yml file to install dpl

feat: Add .gitlab-ci.yml file

feat: Add embedded favicon

Add embedded base64 favicon

feat: Add early blog implementation

It is just a really crappy implementation to get it running until a
figure the pieces of the project out.

Initial commit