Remove references to the Director

[jyasskin]

The Process is now Director-free, but he currently appears in 15 files: https://github.com/search?q=repo%3Aw3c%2FGuide+director&type=code

[jyasskin]

Notes for the remaining 3 references:

• [x] https://www.w3.org/Guide/process/formal-objections.html has a big red box saying not to use the file.
• [x] #206: https://www.w3.org/Guide/process/charter.html still has an intra-page link to the "Director's decision", but the reference to a "Director" is gone from the text.
• [x] Also in charter.html: https://github.com/w3c/Guide/pull/207
• [ ] https://www.w3.org/Guide/process/suspension.html still says that it's the Director who suspends participants.