The site is made up of HTML files, each representing part of a page (sidebar, content, footer, etc.). When a browser visits the site, the server finds the core HTML file for the page (for example, the core file for https://www.libreplanet.org/YEAR/getting-around is /YEAR/getting-around/index.html in the repo), then reads special comments in that file to which instruct it to pull various other HTML files in to produce a complete page, using an Apache feature called SSI. To edit part of a page, you will need to find out which HTML file contains the element in question. Do this by navigating to core HTML file and exploring the comments that start with "#include".
The site is made up of HTML files, each representing part of a page (sidebar, content, footer, etc.). When a browser visits the site, the server finds the core HTML file for the page (for example, the core file for https://www.libreplanet.org/YEAR/getting-around is /YEAR/getting-around/index.html in the repo), then reads special comments in that file to which instruct it to pull various other HTML files in to produce a complete page, using an Apache feature called SSI. To edit part of a page, you will need to find out which HTML file contains the element in question. Do this by navigating to core HTML file and exploring the comments that start with "#include".