chore: remove env from git

This PR removes the development .env file from the repository. Instead, you copy the template in .env.development to your .env during initial setup.

NOTE: I am not 100% sure what will happen to the dev environment of others when this is merged; people may have to copy over the .env.development file to .env again manually!

apps/web/.env

-GRAPHPOLARIS_VERSION=dev
-BACKEND_URL=http://localhost
-BACKEND_WSS_URL=ws://localhost:3001/
-STAGING=dev
-SKIP_LOGIN=true
-BACKEND_USER=:3000
-GRAPHPOLARIS_VERSION=dev
-
-SENTRY_ENABLED=false
-SENTRY_URL=
-
-GP_AUTH_URL=
-
-WIP_TABLEVIS=false
-WIP_NODELINKVIS=false
-WIP_RAWJSONVIS=false
-WIP_PAOHVIS=true
-WIP_MATRIXVIS=true
-WIP_SEMANTICSUBSTRATESVIS=true
-WIP_MAPVIS=true
-
-WIP_INSIGHT_SHARING=true
-WIP_VIEWER_PERMISSIONS=true
-WIP_SHARABLE_EXPLORATION=true
\ No newline at end of file