Firelfy specific header components

[kailasnadh790]

fix: #55 fix: #4 fix: #57

• Dark and mobile Logos
• Removing dependency on separate fragment doc and letting authors add utils in gnav file.
• Dark mode styling for header
• Tooltip for what's new

after: https://feature-utilities--firefly--adobecom.hlx.page/

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Commits

* [57c5b2d](https://github.com/adobecom/firefly/commit/57c5b2df91c01aed76234d3ebad0f17c4386f58c) :white_check_mark: (latest) * [a1b5c3a](https://github.com/adobecom/firefly/commit/a1b5c3a9ca23b0bccc2ad5dba412c8ae7f9fcc5d) :white_check_mark: * [cb062cd](https://github.com/adobecom/firefly/commit/cb062cdf2cb8976343d622e160492260fc1f5241) :white_check_mark: * [ec0deaf](https://github.com/adobecom/firefly/commit/ec0deaf61238ad91c4664a139a64ce201db5b86e) :white_check_mark: * [d091a6a](https://github.com/adobecom/firefly/commit/d091a6a25c8d08d8a04662690a275f172ceb8745) :white_check_mark: * [e43a5ce](https://github.com/adobecom/firefly/commit/e43a5cec746a16f563749141c8598102645bf0c8) :white_check_mark: * [e18f824](https://github.com/adobecom/firefly/commit/e18f824d2232d5b994d7ac49093477f2363c169d) :white_check_mark: * [6f56eb4](https://github.com/adobecom/firefly/commit/6f56eb4fbc035a1d55a3f523179adee47f71113e) :white_check_mark: * [3333596](https://github.com/adobecom/firefly/commit/33335966db9d0e060c8e81669479e0c177162acd) :white_check_mark: * [ae744e4](https://github.com/adobecom/firefly/commit/ae744e465b0f484232638128be131a4095c13d3c) :white_check_mark: * [3562de9](https://github.com/adobecom/firefly/commit/3562de9106dd948bfa0563eb47e3d8dd77313440) :white_check_mark: * [754d0c1](https://github.com/adobecom/firefly/commit/754d0c1b37b476743fbd4eba076ecb92c810828e) :white_check_mark: * [662adff](https://github.com/adobecom/firefly/commit/662adff6134417a9793661a0508f4d84c0444a35) :white_check_mark: * [08cd8f6](https://github.com/adobecom/firefly/commit/08cd8f6e5ee681c77106a8b2ceab3f02f4ec4c30) :white_check_mark: * [4c602bd](https://github.com/adobecom/firefly/commit/4c602bd9179a12a02f9d1f769474a2abf25acd21) :white_check_mark: * [9fd2e4c](https://github.com/adobecom/firefly/commit/9fd2e4c03ee9da08b183ec4512dcddedd954238c) :white_check_mark:

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