Remove HTML code from old posts

[dpordomingo]

There are a lot of posts having HTML code inside, what is not allowed

Since we're trying to have a maintainable blog and being able to redesign it easily we decided to forbid HTML code inside the blog posts after the redesigned. Instead of HTML code, it must be used the available shortcodes for the blog, that can be found in the README.md

we could:

• create new snippets for some interesting layouts
• drop other ones that are not valuable

List of posts having HTML code in its content

[dpordomingo]

/cc @marnovo

[vmarkovtsev]

@dpordomingo The old posts must be updated, it's the upcoming one only.

[marnovo]

@vmarkovtsev where are the interns who were updating this?

[dpordomingo]

The migration to the new blogging platform is almost completed, so we're closing this issue because I think it will be considered during the migration 💆‍♀️