feat(env variables): added env variables

Description

In the project we have two consts: BASE_API_URL and PROJECT_ID which can change depending on the instance. Moved them to .env file. Marked as next_public because they are used during runtime on

Things to consider in the future

• probably we will need some changes when we introduce cypress to the project to test on given instance.

src/constants/api.ts

-export const BASE_API_URL = process.env.NEXT_PUBLIC_BASE_API_URL;
+export const BASE_API_URL = process.env.NEXT_PUBLIC_BASE_API_URL || '';
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