Migrate from KastenHQ/website archive

Signed-off-by: Mark <[email protected]>

.gitignore

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+kanister.io
+node_modules
+package-lock.json
+# TODO: better sources?
+app/src

.node-version

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+18.16.1

README.md

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+
+# Kanister.io web site
+
+## Getting started
+### Make sure you have node/npm installed
+Node is the Javascript runtime and includes NPM, the Node Package Manager, which installs all the JS dependencies.
+
+If you have a Mac and use Homebrew, you can install with `brew install node`. Otherwise, see these instructions: https://docs.npmjs.com/getting-started/installing-node.
+
+#### OPTIONAL: [anyenv](https://anyenv.github.io/) and nodenv for virtual node environments
+
+Visit https://nodejs.org/en and find the LTS release, at the time of this writing it was: 18.17.0, the latest was: 20.4.0
+
+```bash
+# the following are directory independent
+brew install anyenv
+# add to your shell startup file: ~/.*rc: eval "$(anyenv init -)"
+exec $SHELL -l # reload your shell
+
+yes | anyenv install --init \
+  && anyenv install --list
+
+anyenv install nodenv && exec $SHELL -l
+nodenv install --list | grep ^18 # 18.16.1
+nodenv install 18.16.1 && nodenv local $_ && nodenv local # confirm version
+
+# OPTIONAL: update npm and dependencies to latest
+npm --version && npm install -g npm@latest && npm --version
+npm outdated -g --depth=0 && npm update -g corepack
+node --version && npm --version && npx --version # confirm versions
+
+# OPTIONAL: to reset to a clean environment
+npm cache clean --force && rm -rf node_modules package-lock.json kanister.io
+```
+
+### Install Node package dependencies
+```shell
+npm install
+```
+
+## Making changes to the web site
+The website is built from source by a build process called [Gulp](https://gulpjs.com/docs/en/getting-started/quick-start). The default build target is `build-kanister`.
+
+```bash
+npx gulp # executes default target in gulpfile.js
+
+# OPTIONAL: to allow `gulp build`
+npm install gulp-cli
+```
+