Add GSoC 2022-2026 project pages, fix sidebar navigation, fix typos and styling fixes#188

sam-shubham wants to merge 1 commit intoOpenPrinting:masterOpenPrinting/openprinting.github.io:masterfrom

sam-shubham:fix/gsoc-pages-and-navigationsam-shubham/openprinting.github.io:fix/gsoc-pages-and-navigationCopy head branch name to clipboard