html_css: archive old content including README file

[01zulfi]

Complete the following REQUIRED checkboxes:

• I have thoroughly read and understand The Odin Project Contributing Guide
• The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text

Complete the following checkboxes ONLY IF they are applicable to your PR. You can complete them later if they are not currently applicable:

• I have previewed all lesson files included in this PR with the Markdown preview tool to ensure the Markdown content is formatted correctly
• I have ensured all lesson files included in this PR follow the Layout Style Guide

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1. Because:

Related to TheOdinProject/top-meta#109

2. This PR:

1. Archives old html/css lessons as well as the README file.

3. Additional Information:

n/a