templates/base.html: Remove link to nonexistent favicon
templates/about.html: Reword the text about me
templates/base.html: Add "alt" information to logo
tamplates/base.html: Move JS links to the bottom of the page
templates/base.html: Remove link to my google email from the footer

It's already in the Contact section
main.py: Convert image URLs to absolute URLs

As recommended in many places, and to have canonical URLs, this commit
parses the generated templates before serving them to the client. In this
process, the server will now look for any image in the form:

<img prop1="1" src="image1.png" prop2="2"></img>

And it will subsitute the URL with the canonical URL.

In order to have the code structured and that the functions used keep the
same meaning, `template.render_template()` has been added, which is
basically a wrapper around `flask.render_template()`.
main.py: Refactor code that sets up the regular expressions

This way, it's more clear what that code does, and if it needs to be
moved around, it will be centralized in a unit, the function
`add_regex_support()`.
template.render_template: Change URL in links

As well as changing the URLs specified in the images, the URLs in the
links also need to be changed.