remove unnecessary oversized gifs, ignore necessary ones

[edunham]

i really, really don't like getting scolded by the tooling on every push.

here's an audit of every gif that was making warnings, and what this PR does about them.

oversized gif	post	image purpose	disposition
_source/_assets/img/blog/node-graphql/crud-a-quote.gif	https://developer.okta.com/blog/2019/05/29/build-crud-nodejs-graphql	demonstrates where to click in a gui	ignorelist
_source/_assets/img/blog/node-typescript/realtime-chat.gif	https://developer.okta.com/blog/2019/05/07/nodejs-typescript-api	demonstrates concurrent app instance behavior	ignorelist
_source/_assets/img/blog/signin-custom-domain/themed-sign-in.gif	https://developer.okta.com/blog/2023/01/12/signin-custom-domain	demonstrates cupcake site sign-in process	ignorelist
_source/_assets/img/blog/express-auth/login-flow.gif	https://developer.okta.com/blog/2019/05/31/simple-auth-express-fifteen-minutes	demonstrates login flow	ignorelist
_source/_assets/img/blog/react-jwt/select-a-user.gif	https://developer.okta.com/blog/2019/10/02/jwt-react-auth	demonstrates user search process	ignorelist
_source/_assets/img/blog/react-jwt/admins-vs-everyone.gif	https://developer.okta.com/blog/2019/10/02/jwt-react-auth	demonstrates admin search	ignorelist
_source/_assets/img/blog/rxjava-android/whole-flow.gif	https://developer.okta.com/blog/2021/05/26/rxjava-android-with-kotlin	demonstrates login process	ignorelist
_source/_assets/img/blog/first-router-node-express/file-server.gif	https://developer.okta.com/blog/2018/11/27/first-router-node-express	demonstrates how to use url engineering in the address bar	ignorelist
_source/_assets/img/blog/vscode-extensions-for-nodejs/eslint.gif	https://developer.okta.com/blog/2019/05/08/top-vs-code-extensions-for-nodejs-developers	demonstrates extension behavior	ignorelist
_source/_assets/img/blog/vscode-extensions-for-nodejs/npm-palette.gif	https://developer.okta.com/blog/2019/05/08/top-vs-code-extensions-for-nodejs-developers	demonstrates extension behavior	ignorelist
_source/_assets/img/blog/react-redux-jwt/select-a-user.gif	https://developer.okta.com/blog/2019/08/12/build-secure-react-application-redux-jwt	SAME AS REACT JWT POST IMAGE	delete, replace in post
_source/_assets/img/blog/react-redux-jwt/admins-vs-everyone.gif	https://developer.okta.com/blog/2019/08/12/build-secure-react-application-redux-jwt	SAME AS REACT JWT AGAIN	delete, replace in post
_source/_assets/img/blog/vchat-app/chatapp.orig.gif	https://developer.okta.com/blog/2018/05/08/build-video-chat-app-with-javascript-webrtc-and-okta	shows how to click a button that's not even there any more	delete, remove from post
_source/_assets/img/blog/vchat-app/vchat-live-test.gif	https://developer.okta.com/blog/2018/05/08/build-video-chat-app-with-javascript-webrtc-and-okta	demonstrates app functionality	ignorelist

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[edunham]

(taking off review request till the build is happy)