Refactor: Press releases

[machikoyasuda]

closes #234

• Converts 3 press releases from PDF to HTML format
• Corrects links of PDF-version press releases with new HTML-version press release links
• Old PDF links still available

Compare new press releases vs. old

1. https://deploy-preview-261--cal-itp-website.netlify.app/press/cal-itp-dgs-rfp-msa vs. https://deploy-preview-261--cal-itp-website.netlify.app/assets/Contactless.Payments.MSA.pdf
2. https://deploy-preview-261--cal-itp-website.netlify.app/press/valleycan-preloaded-reloadable-ev-charging vs. https://valleycan.org/wp-content/uploads/2022/08/ValleyCAN_PR_080122_Final.pdf
3. https://deploy-preview-261--cal-itp-website.netlify.app/press/cal-itp-first-net-cellular-plans vs. https://deploy-preview-261--cal-itp-website.netlify.app/assets/Cal-ITP.FirstNet.PressRelease.221103.pdf

Notes

• The links in these press releases are regular links, formatted in Markdown. They do NOT have target="_blank" in them. It would be a lot of manual work to convert all of them, and that's not something we've done on prior HTML press releases. Users can click their web browser Back button to go back, or use keyboard shortcuts, etc.
• In the case where a web-headline was written for a PDF headline, the web-headline was used.
• Headlines were changed to sentence-case.

Testing social media link preview

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[thekaveman]

These changes all look great 👍