Render Google Ads docs for users with Adblockers

[teallarson]

What

Adresses part of #13555

Before: Users with adblocker browser plugins would not see our Google Ads documentation in our documentation side panel. They would instead see "no documentation found for this connector". But we do have (beautiful) docs for it!

This only appears to have affected Google Ads. Not other plugins with the word Ad and not other plugins with the word Google.

Now: Users can see the docs 🎉

Note: The H1 is still stripped out. This appears to affect a few docs when Adblockers are on. I'm not addressing that in this PR.

How

1. In the gradle build, we now rename google-ads.md as gglad.md
2. We also tell our proxy to point to google-ads.md if gglad.md is requested so users on localhost see the right docs
3. Where we set the documentation URL in the context, we now ensure that google-ads is replaced by gglad

Recommended reading order

1. DocumenationPanelContext.tsx
2. build.gradle
3. setupProxy.js

Testing

Testing this with various ad-blocking plugins may be helpful. I've tested it manually using Adblock Plus on Firefox and Chrome.

1. At the root of the repo in this branch, run SUB_BUILD=PLATFORM ./gradlew :airbyte-webapp:copyDocs --rerun-tasks. This will rebuild the docs.
2. In airbyte-webapp run npm start
3. Try adding a Google Ads source, verify that you can see the documentation