404 - Page added for the forthcoming new design and some tweaks

I never noticed it was missing until I found a broken link to another blog post. So I built one. I also added a few things in the background to prepare the site for further changes. I mainly wanted a 404 page, the ability to display gifs without them being blurry and to disable interpolation as much as possible. LET THE PIXELS BREATHE >:D. I will be adding many more changes over the next few days and weeks, without making much of a fuss, until major changes are done. This entry will probably never be read by anyone but me BUT it's there :D.

Thanks to a good friend, the header and footer are now as good as posible implemented (in terms of my requirements and web standards). Thanks a lot! Finally! The previous code was not very good when it came to web standards.

Sources:

• https://stackoverflow.com/questions/2810262/how-to-stick-text-to-the-bottom-of-the-page
• https://docs.github.com/en/pages/getting-started-with-github-pages/creating-a-custom-404-page-for-your-github-pages-site
• https://simplystatic.com/tutorials/404-pages-for-static-sites/
• /404.html
• https://stackoverflow.com/questions/2092827/can-i-use-a-gif-animation-as-favicon-for-my-website
• https://stackoverflow.com/questions/10525107/pixel-art-in-html5-canvas-is-blurry-when-scaled-up
• https://stackoverflow.com/questions/21492048/css-why-is-top-0px-not-positioning-an-absolutely-positioned-p-element-with
• https://www.w3schools.com/css/css3_variables.asp
• https://stackoverflow.com/questions/31845895/how-can-i-build-concatenate-strings-in-javascript
• https://stackoverflow.com/questions/25962958/calling-a-javascript-function-in-another-js-file
• https://stackoverflow.com/questions/4982480/how-to-set-the-margin-or-padding-as-percentage-of-height-of-parent-container
• https://www.30secondsofcode.org/css/s/footer-at-the-bottom/
• https://www.w3schools.com/jsref/jsref_replace.asp
• https://stackoverflow.com/questions/36921947/read-a-server-side-file-using-javascript
• https://stackoverflow.com/questions/54950838/how-to-use-fetch-with-async-await/54950884#54950884
• https://stackoverflow.com/questions/39758031/get-text-from-a-txt-file-in-the-url
• https://stackoverflow.com/questions/41775517/waiting-for-the-fetch-to-complete-and-then-execute-the-next-instruction
• https://www.html-seminar.de/class_und_id.htm
• https://www.w3schools.com/js/js_ajax_intro.asp