Add FE deployment script

[ainefairbrother]

deploy_igsr_fe.sh automates the FE deployment process.

• Use-case is if you make a change to the FE code and need to build image and push to GC docker repository and have the changes reflected on the dev or prod website.
• The script has a --dry-run mode to verify what will be run.

Deploy to dev

cd gca_1000genomes_website
./scripts/deploy_igsr_fe.sh \
--path . \
--env dev

Deploy to prod

cd gca_1000genomes_website
./scripts/deploy_igsr_fe.sh \
--path . \
--env prod

In this PR, I also added a couple of features to local_igsr_site_instance_up.sh:

• --fe-dev mode activates data portal watch/sync mode after FE container starts, allowing quick iteration of data portal features.
• --skip-index mode skips index generation if the indices already exist in the local ES instance.