feat: support image link

[Songmu]

No description provided.

[k1LoW]

Wow!!!!

[github-actions]

Code Metrics Report

	main (32008dc)	#414 (5243a08)	+/-
Coverage	32.2%	32.2%	-0.1%
Code to Test Ratio	1:0.8	1:0.8	-0.1
Test Execution Time	11s	11s	0s

Details

  |                     | main (32008dc) | #414 (5243a08) |  +/-  |
  |---------------------|----------------|----------------|-------|
- | Coverage            |          32.2% |          32.2% | -0.1% |
  |   Files             |             26 |             26 |     0 |
  |   Lines             |           3089 |           3111 |   +22 |
+ |   Covered           |            996 |           1002 |    +6 |
- | Code to Test Ratio  |          1:0.8 |          1:0.8 |  -0.1 |
  |   Code              |           6339 |           6402 |   +63 |
+ |   Test              |           5595 |           5598 |    +3 |
  | Test Execution Time |            11s |            11s |    0s |

Code coverage of files in pull request scope (46.0% → 45.8%)

Files	Coverage	+/-	Status
action.go	80.6%	-0.2%	modified
apply.go	1.3%	-0.1%	modified
compare.go	50.0%	+0.6%	modified
convert.go	0.0%	0.0%	modified
md/md.go	78.6%	+0.0%	modified
preload.go	0.0%	0.0%	modified
slide.go	65.9%	-0.8%	modified

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Reported by octocov