Update post properties

‘ID’ shouldn’t be necessary anymore, since it shouldn’t be used for RSS
generation. ‘PUBDATE’ should be ‘DATE’. ‘FILE_TAGS’ is actually ‘FILETAGS’.

posts/a-very-important-blog-post.org

@@ -1,5 +1,4 @@
 #+TITLE: A very important blog post
-#+ID: a-very-important-blog-post
-#+PUBDATE: <2020-02-23 Sun 18:28>
+#+DATE: <2020-02-23 Sun 18:28>
 
 Very important business here.

posts/my-new-emacs-configuration.org

@@ -1,7 +1,6 @@
 #+TITLE: My new Emacs configuration
-#+ID: my-new-emacs-configuration
-#+PUBDATE: <2019-10-06 Sun 18:18>
-#+TAGS: draft
+#+DATE: <2019-10-06 Sun 18:18>
+#+FILETAGS: draft
 
 I'm still working on this one.
 

posts/new-blog.org

@@ -1,6 +1,5 @@
 #+TITLE: New Blog
-#+ID: new-blog
-#+PUBDATE: <2019-10-06 Sun 12:55>
+#+DATE: <2019-10-06 Sun 12:55>
 
 It's that time again... I've started a new project to build and maintain my site
 and of course it has to come with a new blog post. I'm trying to have it

posts/wdocker-compose.org

@@ -1,8 +1,8 @@
 #+TITLE: Making docker-compose easier with wdocker
-#+PUBDATE: <2016-02-21>
-#+FILE_TAGS: wdocker docker docker-compose
+#+DATE: <2016-02-21>
+#+STARTUP: showall
+#+FILETAGS: wdocker docker docker-compose
 #+OPTIONS: num:nil toc:nil
-#+ID: wdocker-compose
 
 [[https://github.com/babab/wdocker][wdocker]] is a little utility written by a [[https://benjamin.althu.es][friend]] and former colleague
 of mine. It allows you to define commands for it in a