Update application.js

[AnitaYCheng]

Switch use of # in headings to link icon like in the TTS handbook, to make the heading links accessible to screenreaders. This includes adding the SVG link icon to the application.

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[MelissaBraxton]

Hey @jasnakai !

Would you be up for reviewing this to see if it fixes the header issue?

Two things:

• @AnitaYCheng ended up changing code in the application.js file because that seemed like the only way to go given how the site is structured.
• I can't seem to make the pages preview work to check it out (we're working w/ GH on the web rather than locally), so if you have any thoughts on why that's happening, we'd love to know! Or, if you run into problems with that, let us know!

[mgwalker]

@AnitaYCheng If you have access to create branches directly on this repo instead of using a fork, that will make cloud.gov Pages run the build. It doesn't build PRs from forks.

@MelissaBraxton I got an email about this. I don't know why. 😂 I hope it's okay that I hopped in!

[MelissaBraxton]

Oh! I didn't pick up on this being a fork... Thanks @mgwalker! (And you're always welcome to hop in!)

[AnitaYCheng]

Duplicate PR, this was a separate branch before I was a member of the repo. #373 replaces this PR.