Refine "Selecting a GSoC contributor" docs (#132)

bundle update

bundle update

fix trailing whitespace

Update 19-selecting_students_and_mentors.md

Update 18-making_your_ideas_page.md

Update 15-special_circumstances.md

Update 02-notes_for_first_year_organizations.md

Bump nokogiri from 1.16.7 to 1.18.3 in the bundler group

Update 11-setting_expectations.md

Update 05-selecting_a_student.md

Update 02-notes_for_first_year_organizations.md

Update 00-what_is_google_summer_of_code.md

Update 20-org_application.md

periodic dependency update

bundle update

periodic package updates

bundle update

Periodic dependency update.

Bump rexml from 3.2.6 to 3.2.8 in the bundler group across 1 directory

periodic dependency update

Bump nokogiri in the bundler group across 1 directory

docs: Fix Markdown Lint Errors in Communication Best Practices Guide (#…

Update 11-communication_best_practices.md

periodic dependency update

Remove mention of plaintext proposal.

fix trailing whitespace