- added custom spinner to use instead of imported ones

- added new empty blog post
- changed react-helmet to react-helmet-async for faster tab title change and reduced console warning
- better eslint config and corresponding warning fixes (changing let -> const, removed unused variables, etc.)
- removed redundant Router from footer
- removed ignored preload attribute value from font loading link tag in index.html

source/src/components/Navbar.tsx

@@ -1,6 +1,6 @@
 import { FontAwesomeIcon } from "@fortawesome/react-fontawesome"
 import { faGithub } from "@fortawesome/free-brands-svg-icons"
-import styled, { ThemeConsumer } from "styled-components"
+import styled from "styled-components"
 import theme from "styled-theming"
 import ReactTooltip from "react-tooltip"
 import NavbarData from "../data/NavbarData"