Add `devsrv` shell script for convenient, env-based execution of LiquiDoc

[briandominick]

I have been working on a Bash script called devsrv, which I use locally when playing with Codewriting, and now with more formal LDCMF projects. When it is truly a general-applicatin LDCMF utility, I will add it to the boilerplate (this repo) and share it with everyone. This will likely replace your commonly used bundle exec liquidoc -c _configs/build-docs.yml --etc --etc commands, first establishing default options based on the deployment environment.

Basic environments will include:

dev Running simply sh devsrv will execute a local build and Jekyll serve operation, by default running no tests.

stage This build runs tests. Use sh devsrv stage --serve-after to spin up a local instance once tests are run. Try sh devsrv stage 4001 --serve-after to spin up a local instance at port :4001 instead of default port. The stage build is probably what is run during continuous deployment ops during draft reviews.

search Pushes updated records to appropriate Algolia cloud search indices. Possibly run manually or under certain conditions by the deployment ops.

prod The final product, only to be as part of deployment ops.

The script also allows the passing of version ranges: sh devsrv 3.2-4.5, to generate just that range of docs versions.

Lots of other operations enable modifications of the standard environments.