chore: Add CI with Github Actions

[Merkur39]

Remove Travis and continuous deployment implemented here #679 (to be iso with other apps).

### 🔧 Tech

* Remove Travis
* Remove continuous deployment

[bundlemon]

BundleMon

Unchanged files (16)

Status	Path	Size	Limits
✅	vendors/settings.(hash).js	1MB	-
✅	app/settings.(hash).js	94.21KB	-
✅	intents/settings.(hash).js	44.79KB	-
✅	img/export-cozy-mail.(hash).svg	27.39KB	-
✅	img/import-cozy.(hash).svg	11.09KB	-
✅	app-settings.(hash).min.css	9.9KB	-
✅	img/double_authent_prez_banner.(hash).svg	4.36KB	-
✅	img/protect_data_point.(hash).svg	4.1KB	-
✅	img/niv_secu_point.(hash).svg	1.54KB	-
✅	intents-settings.(hash).min.css	1.27KB	-
✅	img/icon-bills.(hash).svg	703B	-
✅	img/icon-laptop.(hash).svg	439B	-
✅	img/icon-arrow-left.(hash).svg	414B	-
✅	img/icon-question-mark.(hash).svg	386B	-
✅	img/icon-check.(hash).svg	369B	-
✅	img/icon-phone.(hash).svg	343B	-

Total files change +2B 0%

Unchanged groups (3)

Status	Path	Size	Limits
✅	**/*.js	1.14MB	-
✅	img/.	51.07KB	-
✅	**/*.css	41.89KB	-

Final result: ✅

View report in BundleMon website ➡️

---

Current branch size history | Target branch size history

[cballevre]

LGTM 👍 We just need to found a place to keep a track of the continus deployement experiment