Features: related image path, support mermaid and add TOC to each blog single page

[leoli0605]

• added 'Context' for related image path
• added hugo module for mermaid diagram
• added TOC to blog single page

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[tfsomrat]

hey @leoli0605, thanks for the PR. can you add an example of mermaid to the elements page?

[leoli0605]

hey @leoli0605, thanks for the PR. can you add an example of mermaid to the elements page?

Hi @tfsomrat, sure, I just push a new commit for the mermaid example.