App is very heavy

[Phyks]

App currently weights nearly 500ko. I think we could reduce it a bit.

[eliemichel]

It's actually much worst:

$ du -h --exclude .git --exclude doc
104K   ./img/headers/icons
24K    ./img/headers/ui/organic
20K    ./img/headers/ui/dark
12K    ./img/headers/ui/overlay
92K    ./img/headers/ui
200K   ./img/headers
68K    ./img/icons
36K    ./img/leaflet
396K   ./img
104K   ./css
168K   ./fonts
372K   ./js
1,1M   .

1. I think we will eventually be able to drop almost any image from img/leaflet as we redefined our owns.
2. We need to figure out why img/heqders is so heavy.
3. Some compressions of images might be worth it (especially SVGs)
4. We can also minify CSS and JS.

[Phyks]

Plus we should distinguish between our js and vendor js, to make the app more readable.

[eliemichel]

I agree, and same for CSS.

[eliemichel]

To be confirmed, but it seems that those stylesheets are not used:

• css/lib/leaflet-routing-machine.css
• css/lib/leaflet.touring.icons.css
• css/lib/leaflet.touring.icons.svg

PS: @Phyks c663cc1 moves vendor code into lib directories in js/ and css/.

[Phyks]

Additionally, we should write a build script to minify js and css, but also translations. All of the translations should be compiled in a single ini file (actual l10n/locales.ini).