Until now, only the current grants were written. But that was not
fair.

With this commit, a short history of the project has been added,
mentioning all the relevant institues and grants.

Until now, the supporting organizations section of the Maneage webpage
didn't contain the AEI logo for the two grants that we have been using
to develop Maneage.

With this commit it has been added, along with a short description for
the current grant. Previous grants will also be mentioned soon.

Until now, the old pixelated PNG format of CEFCA's logo was being
used. However, recently Marjan Akbari made an SVG replica of the
format and published it on Wikipedia:
https://commons.wikimedia.org/wiki/File:CEFCA-logo.svg

With this commit, this vector graphics logo is being used instead.

As described in the previous commit, Maneage is now based in CEFCA.
But in the previous commit, I forgot to add the CEFCA logo to the top
of the main page as a supporting organization.

With this commit, the logo has been added.

In the initial version of the paper, we had this nice figure to show
the file structure of Maneage, so I thought its good to put it in the
page describing Maneage's file architecture.

Also, the long copyright at the end of the page was summarized into
one line and a link to the GPL has been added.

Until now, the raw link as text wasn't too obvious for a new viewer of
the webpage. So a snapshot was taken from the start of the video
created by RDA of my talk and added in the page to be more prominent
and help new viewers notice it more clearly.

In the previous commit, I added comment wrongly by having '%%'
around comment about copyright in the SVG file of the project-flow
image. Because of this mistake, the image was not displayed in the
website.

Whit this commit, I replaced '%%' with '<!--' and image can be seen in
the website.

Until now, The project-flow SVG image was saved as optimized SVG
with comments saved in it by Inkscape. This made its size about
than 230 KB. The icon of paper in the image was also a simple paper.

With this commit, I modified the icon of the paper and added some
details: a small shape made of a square and circle inside the
text of the paper to look like a figure. Then I saved it as an
optimized SVG file without any comments. This allows us to have
a file with 208KB size.

For putting the image in the website I also decreased its size, so
it was necessary to center it. To do this, I added a general class
'.center' for this job and added it in 'base.css' at the end of
General style section to allow us have everything with this class
in the center.

When we look at the SVG in systems with different fonts, the result
is not the same.

This SVG figure was modeled on the slides that present Maneage and
created with Inkscape from scratch. Because converting the EPS/PDF
created by LaTeX would make the SVG around 1Mb, but making the svg
from scratch, it is now 44Kb :-).