Update entrialliance.github.io for conference to reflect v0.0.2

[jordanperr]

• Update block diagram on homepage for new components (py-entr, dbt package, etc).
• Expand entr_warehouse section on homepage to include openoa-dbt packages. @lewisarmistead
• Expand OpenOA section on homepage to include py-entr package.
• Add information on CI to contributing guidelines page. @jordanperr
• Installation page -> entr_runtime readme. Update entr_runtime readme. Blurb about building on ARM.
• Developer guide page -> Update to reflect new paths, pyentr, etc. VSCode dev container?
• Use entralliance.github.io documentation instead of runtime readmes.
• Update location of examples to point to runtime folder @ejsimley
• Update getting started sections
• add remaining packages to packages sections (following README updates)
• add link to entralliance.github.io contributing guidelines to all repo READMEs
• Update high-level package descriptions
  • dbt-entr
  • dbt-openoa
  • py-entr
  • entr_warehouse
  • entr_runtime
• add pull request templates to all repos
• add issue templates to all repos
• update entralliance.github.io to only build on changes to main & gh-pages branches
• add CLA