Change 'jekyll' to 'Jekyll'
Add configuration to be similar to Github's Jekyll

Add
safe: true
lsi: false
to _config.yml.

Since Github will use these values, it is better to add them here so
that we don't get confused in the future. Particularly, the 'safe: true'
option means that we can't use third party plugins.
Add draft posts.
Add post describing how to compile MedialElch
Publish the post about compiling MediaElch

Moved the post from the _drafts folder to the _posts folder with the
appropriated name.