Release 1.5.5

• updated some html structure to fit the latest app.css and theme styles
• updated app.css
• removed Bootstrap dependency
• fixed ampersand problem in global graph (issue #47)
• added default font size environment variable (issue #80)
• added escape key function for modal close button (PR #82) thank to @stellarix
• added homepage environment variable (PR #84) thanks to @NotGovernor
• added composer
• added build script
• updated highlight.js to 11.7.0
• updated jquery to 3.7.0
• updated mermaid to 8.12.1
• updated vis-network to 9.1.6