[Markdown] [Glossary] Prepare Glossary for Markdowning

[wbamberg]

This PR prepares the Glossary docs for Markdowning.

There wasn't much to do! Thanks to @hamishwillee for prep work here.

Conversion report:

## All unhandled elements
- sub (8)
- section#Quick_links (1)
## Details per Document
### [/en-US/docs/Glossary/Bézier_curve](https://developer.mozilla.org/en-US/docs/Glossary/Bézier_curve)
### Missing conversion rules
- sub (13:173)
- sub (13:188)
- sub (13:203)
- sub (13:222)
- sub (15:64)
- sub (15:81)
- sub (15:114)
- sub (15:131)
### [/en-US/docs/Glossary](https://developer.mozilla.org/en-US/docs/Glossary)
### Missing conversion rules
- section#Quick_links (28:1)

We need the quick_links if the main page is to have a sidebar, and I thought it was better to keep <sub> for the Bézier page.

After this we can convert another >500 pages \o/.

[github-actions]

Preview URLs

• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/CORS-safelisted_response_header
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/CSS_Selector
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/Cipher
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/Client_hints
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/DOS_attack
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/Falsy
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/Grid
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/Grid_Areas
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/Grid_Cell
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/Grid_Lines
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/Grid_Tracks
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/Gutters
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/IDL
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/OpenGL
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/Response_header
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/Round_Trip_Time_(RTT)
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/cacheable
• https://pr9361.content.dev.mdn.mozit.cloud/en-US/docs/Glossary/percent-encoding

Flaws

Note! 14 documents with no flaws that don't need to be listed. 🎉

URL: /en-US/docs/Glossary/CSS_Selector
Title: Selector (CSS)
on GitHub
Flaw count: 1

• macros:
  • /en-US/docs/Glossary/CSS_class does not exist

---

URL: /en-US/docs/Glossary/Cipher
Title: Cipher
on GitHub
Flaw count: 2

• macros:
  • /en-US/docs/Glossary/attack does not exist
• broken_links:
  • Can't resolve /en-US/docs/Archive/Security/Encryption_and_Decryption

---

URL: /en-US/docs/Glossary/Response_header
Title: Response header
on GitHub
Flaw count: 1

• macros:
  • /en-US/docs/Glossary/Fetch_metadata_response_header does not exist

---

URL: /en-US/docs/Glossary/Grid
Title: Grid
on GitHub
Flaw count: 1

• macros:
  • /en-US/docs/Glossary/grid_item does not exist

External URLs

URL: /en-US/docs/Glossary/DOS_attack
Title: DoS attack
on GitHub

No new external URLs

---

URL: /en-US/docs/Glossary/cacheable
Title: Cacheable
on GitHub

No new external URLs

---

URL: /en-US/docs/Glossary/Grid_Tracks
Title: Grid Tracks
on GitHub

No new external URLs

---

URL: /en-US/docs/Glossary/CSS_Selector
Title: Selector (CSS)
on GitHub

No new external URLs

---

URL: /en-US/docs/Glossary/Gutters
Title: Gutters
on GitHub

No new external URLs

---

URL: /en-US/docs/Glossary/Client_hints
Title: Client hints
on GitHub

No new external URLs

---

URL: /en-US/docs/Glossary/Cipher
Title: Cipher
on GitHub

• https://en.wikipedia.org/wiki/One-time_pad (1 time) (Note! This may be a new URL 👀)
• https://en.wikipedia.org/wiki/Permutation_cipher (1 time) (Note! This may be a new URL 👀)
• https://en.wikipedia.org/wiki/Substitution_cipher (1 time) (Note! This may be a new URL 👀)
• https://en.wikipedia.org/wiki/Transposition_cipher (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Glossary/Grid_Lines
Title: Grid Lines
on GitHub

No new external URLs

---

URL: /en-US/docs/Glossary/Response_header
Title: Response header
on GitHub

No new external URLs

---

URL: /en-US/docs/Glossary/percent-encoding
Title: Percent-encoding
on GitHub

No new external URLs

---

URL: /en-US/docs/Glossary/Falsy
Title: Falsy
on GitHub

No new external URLs

---

URL: /en-US/docs/Glossary/Grid_Areas
Title: Grid Areas
on GitHub

No new external URLs

---

URL: /en-US/docs/Glossary/IDL
Title: IDL
on GitHub

No new external URLs

---

URL: /en-US/docs/Glossary/Grid
Title: Grid
on GitHub

No new external URLs

---

URL: /en-US/docs/Glossary/Round_Trip_Time_(RTT)
Title: Round Trip Time (RTT)
on GitHub

No new external URLs

---

URL: /en-US/docs/Glossary/CORS-safelisted_response_header
Title: CORS-safelisted response header
on GitHub

• Safelist Content-Length header whatwg/fetch#626 (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Glossary/Grid_Cell
Title: Grid Cell
on GitHub

No new external URLs

---

URL: /en-US/docs/Glossary/OpenGL
Title: OpenGL
on GitHub

No new external URLs

[teoli2003]

Looks good!