Improvements for new home page (Pricing Calculator and Call to Action)

## Light theme

- [x] GameCI logo not showing properly (only saw this on Safari, Chrome and Firefox are fine)

Details


- [ ] #493

- [x] "Developers that chose us" section could keep a dark background

Details


- [x] Pricing calculator doesn't seem to use the light / dark theme and logos become black on black

Details


## Content

- [ ] "Developers that chose us" section: We should fill this with a few more logos (we could request the community with an announcement on github for asking people to contribute their logo)

## Pricing Calculator

- [ ] Right now, pricing calculator always start with Euros. Could be interesting to use user's region if available (is that possible?)
- [ ] **The price is always 0**
- [ ] There could be an explanation of what the pricing calculator is and what are the _minutes_

### Suggestions for a fix :

1. ~We keep it as is (not cool, we can do better than this)~
2. We remove it from the homepage (this is quick, but we can probably do better. Still better than how it is right now)
3. We add a note saying GameCI is free, refer to CI providers for actual prices
4. We input prices based on today's values and add something like last updated on 2024-05-08
5. We do like 5, but we create a cron job that will feed itself on a data source to update the values on a daily basis (with last updated on).

## Layout

It could be interesting to revisit this in the future.

## Other thoughts

* It would be nice to have some SVGs or illustrations that helps explaining what GameCI is.
* It's not clear to me at first sight that GameCI is a technical project, showing some code snippet as examples beside a getting started is usually a good way to show that it's technical 😅