Bug fixes, typos and styling fixes

What’s Changed

• Caption and Description fix for CSS Figure 28 (#1748) @bazzadp
• Fix relative links in ebook (#1744) @bazzadp
• Replace gzip with Gzip and brotli with Brotli (#1745) @bazzadp
• Update Twitter handle for Caleb Queern (#1743) @lex111
• Adjust position of switcher arrow (#1740) @lex111
• Fix broken links (#1735) @lex111
• Remove formatting character from caching.md (#1738) @roryhewitt
• Update Third Parties contributors (#1722) @rviscomi
• Caching: Added new picture and tweaked text (#1723) @roryhewitt
• Stop including chapters with no featured quote in home page (#1714) @bazzadp
• Support redirecting uppercase chapter urls to lowercase (#1706) @bazzadp
• Update Twitter for Giovanni Puntil (#1734) @giopunt
• Improve Russian translation (#1733) @lex111
• Increase line height for content elements (#1730) @lex111
• Fix bug with unsetting code background color in places (#1731) @bazzadp
• Improve inline code styling (#1729) @lex111
• Ebook layout issues (#1727) @bazzadp
• Big figure tweaks (#1726) @bazzadp
• Various minor fixes (#1721) @lex111
• Add highlight to inline code (#1718) @lex111
• Fix JS chapter image 404 (#1724) @rviscomi
• fix: resource hints image style (#1719) @Zizzamia
• Compression 2020 edits (#1688) @exterkamp
• fixes typo for in-page link in css chapter (#1720) @argyleink
• Update playground URL (#1713) @LeaVerou