cluster, diffimg, dijkstra, dotty, gvedit, gvgen, gvmap: add page

[Kabiirk]

Hi!

W.r.t issue #2580 , I've added the commands cluster, diffimg, dijkstra, dotty, gvedit, gvgen, gvmap. A few notes:

1. As per Graphviz documentation, dotty graph editor has been deprecated. I've highlighted this in dotty's documentation as a separate Note. (I think people now use gvedit or any other online service for this)
2. These commands can be run on multiple platforms (Mac, Windows, Linux etc.) hence, I've put them in the pages/common/ directory as per convention.

Let me know if there are any other code changes/modalities required from my side.

P.S.
Also, please clarify if I need to agree to the the CLA for tldr-pages/tldr as well.

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page(s) have at most 8 examples.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR title conforms to the recommended templates.

[CLAassistant]

All committers have signed the CLA.

[tldr-bot]

The build for this PR failed with the following error(s) at commit
7fafd8488fd7925dc26e8b494411a6f8480dba18:

pages/common/cluster.md:25:25 MD047/single-trailing-newline Files should end with a single newline character
pages/common/dijkstra.md:21:34 MD047/single-trailing-newline Files should end with a single newline character
pages/common/dotty.md:22:41 MD047/single-trailing-newline Files should end with a single newline character
pages/common/gvedit.md:21:11 MD047/single-trailing-newline Files should end with a single newline character
pages/common/gvgen.md:33:10 MD047/single-trailing-newline Files should end with a single newline character
pages/common/gvmap.md:29:56 MD047/single-trailing-newline Files should end with a single newline character
pages/common/cluster.md:1: TLDR009 Page should contain a newline at end of file
pages/common/dijkstra.md:1: TLDR009 Page should contain a newline at end of file
pages/common/dotty.md:1: TLDR009 Page should contain a newline at end of file
pages/common/gvedit.md:1: TLDR009 Page should contain a newline at end of file
pages/common/gvgen.md:1: TLDR009 Page should contain a newline at end of file
pages/common/gvmap.md:1: TLDR009 Page should contain a newline at end of file

Please fix the error(s) and push again.

[Managor]

I'll let it slide this time, but next time limit the new page count in a PR to 5 to make it less taxing to review

[Kabiirk]

@Managor, Thanks for your review, I've incorporated all changes except one, I require your inputs on changes to pages/common/gvedit.md.

Understood, I'll keep the page limit in mind for future PRs. I suggest you add this to the content guidelines.

[Managor]

Mnemonics allow the user to memorize what the option is short for. https://github.com/tldr-pages/tldr/blob/main/contributing-guides/style-guide.md#short-option-mnemonics

[Kabiirk]

@Managor, Thanks for your detailed suggestions & prompt approval!