Update theme for Telos

[ezra-sg]

• update logo in the top left to Telos acorn + "Telos Bridge"
• update document title (tab name) to "Telos Bridge"
• add favicon (icon next to tab name)
• add Telos color theme
• remove theme switcher from navbar
• add Telos logo/links to footer (left, right, docs)

[netlify[bot]]

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