bundle update

fix: Correct typos in selecting stuent.md

Fix spelling mistakes in writing-a-proposal guide

Fix trailing whitespace.

Fix formatting in proposal guidelines section

Update 06-writing_a_proposal.md

Update 00-what_is_google_summer_of_code.md

periodic bundle update

fix new markdownlint error around email addresses

bundle update

Update IRC references from Freenode to Libera.Chat

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

bundle update

bundle update

fix trailing whitespace